Top n Analysis using correlated subquery

Please explain this query. It is doing top n analysis using correlated subquery. I need explaination of execution of this query.
Select distinct a.sal
From emp a
where 1=(select count ( distinct b.sal) from emp b
where a.sal <=b.sal)
Thanks in advance

Try breaking the query down and rewriting it in order to follow the logic;
SQL> --
SQL> -- Start by getting each salary from emp along with a count of all salaries in emp
SQL> --
SQL> select   a.sal,
        (select count (distinct b.sal) from scott.emp b ) count_sal
from scott.emp a
order by 1 desc
       SAL COUNT_SAL
      5000         12
      3000         12
      3000         12
      2975         12
      2850         12
      2450         12
      1600         12
      1500         12
      1300         12
      1250         12
      1250         12
      1100         12
       950         12
       800         12
14 rows selected.
SQL> --
SQL> --Add a condition to the count for only salaries below or equal to the current salarySQL> --
SQL> select   a.sal,
        (select count (distinct b.sal) from scott.emp b where a.sal <=b.sal) rank_sal
from scott.emp a
order by 1 desc
       SAL   RANK_SAL
      5000          1
      3000          2
      3000          2
      2975          3
      2850          4
      2450          5
      1600          6
      1500          7
      1300          8
      1250          9
      1250          9
      1100         10
       950         11
       800         12
14 rows selected.
SQL> --
SQL> -- Add a condition to only pick the nth highest salary
SQL> --
SQL> select    a.sal,
         (select count (distinct b.sal) from scott.emp b where a.sal <=b.sal) rank_sal
from scott.emp a
where (select count (distinct b.sal) from scott.emp b where a.sal <=b.sal) = 4
       SAL   RANK_SAL
      2850          4
1 row selected.Hope this helps.

Similar Messages

Top n analysis using hierarchial queries

hi all,
can we do top n analysis in hierarchial queries using level pseudo columns. if so please give an example.
thanks and regards,
sri ram.

Hi,
Analytic functions (such as RANK) often interfere with CONNECT BY queries. Do one of them in a sub-query, and the other in a super-query, as shown below.
If you do the CONNECT BY first, use ROWNUM (which is assigned after ORDER SIBLINGS BY is applied) to preserve the order of the CONNECT BY query.
WITH     connect_by_results     AS
     SELECT     LPAD ( ' '
               , 3 * (LEVEL - 1)
               ) || ename          AS iname
     ,     sal
     ,     ROWNUM               AS r_num
     FROM     scott.emp
     START WITH     mgr     IS NULL
     CONNECT BY     mgr     = PRIOR empno
     ORDER SIBLINGS BY     ename
SELECT       iname
,       sal
,       RANK () OVER (ORDER BY sal DESC)     AS sal_rank
FROM       connect_by_results
ORDER BY r_num
;Output:
INAME                  SAL   SAL_RANK
KING                  5000          1
   BLAKE              2850          5
      ALLEN           1600          7
      JAMES            950         13
      MARTIN          1250         10
      TURNER          1500          8
      WARD            1250         10
   CLARK              2450          6
      MILLER          1300          9
   JONES              2975          4
      FORD            3000          2
         SMITH         800         14
      SCOTT           3000          2
         ADAMS        1100         12
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only), and the results you want from that data. If you use only commonly available tables (such as those in the scott or hr schemas), then you don't have to post any sample data; just post the results.
Explain how you get those results from that data.
Always say what version of oracle you're using.

How to write this query using correlation subquery or non exists clause

-- Tables description.
--step-1- 4 employees present in EMP table.
--step-2- each employee having 1 country_no in EMP_DOCS table.3 employees having same country_no(i.e emp's 1,2,3)
--step-3- 1 emp document can have multiple items.In this case each employee having one each in the EMP_ITEMS table.
--step-4- 1 EMPLOYEE can have Multiple Documents so we have a relation between EMP_ITEMS and DOCUMENT_ITEMS.whatever items present in EMP_ITEMS those items will be inserted into DOCUMENT_ITEMS.so we have a item-item relation.
--so we stored EMP_ITEMS id in EMP_ITEMS_REF_ID_1 of DOCUMENT_ITEMS table.
-- step-5- DOCUMENT-INVOICE has 1-1 relation once invoice is created we stored invoice id in DOCUMENT table.
--This is the requirement.Let's say in this example 3 employees are using same country_no and 4th employee is using another country_no
--which is not used by other 3 employees.
--Condtion-1:
--if all of the employees have created INVOICE which is using same country_no of different country_no then the query should display all records.
--Condition-2:
--if any one of the employee not created INVOICE which is using same country_no of other employees then remaining employees also should not come in the query
-- even though invoice is created by other employees.
--Condition-3:
--if any one of the employee not created even DOCUMENT which is using same country_no of other employees then remaining employees also should not come in the query
-- even though invoice is created by other employees.
I hope I explain the conditions clearly.if you understand well by looking at the data i posted below may i know what is the final result should be displayed?
create table EMP
ID       NUMBER not null,
TYPE     VARCHAR2(1)
alter table EMP
add constraint ID primary key (ID);
create table EMP_DOCS
ID         NUMBER not null,
EMP_ID     NUMBER,
COUNTRY_NO VARCHAR2(15)
alter table EMP_DOCS
add constraint PK_EMP_DT primary key (ID);
alter table EMP_DOCS
add constraint FK_EMP_DT foreign key (EMP_ID)
references EMP (ID);
create table EMP_ITEMS
ID         NUMBER not null,
EMP_DOC_ID     NUMBER
alter table EMP_ITEMS
add constraint PK_EMP_ITEMS_DT primary key (ID);
alter table EMP_ITEMS
add constraint FK_EMP_ITEMS_DT foreign key (EMP_DOC_ID)
references EMP_DOCS (ID);
create table DOCUMENT
ID   NUMBER not null,
DOCNO VARCHAR2(15),
INVOICE_REF_1 NUMBER
alter table DOCUMENT
add constraint DOC_PK_ID primary key (ID);
create table DOCUMENT_ITEMS
ID         NUMBER not null,
DOC_ID     NUMBER,
EMP_ITEMS_REF_ID_1    NUMBER
alter table DOCUMENT_ITEMS
add constraint PK_DOCUMENT_ITEMS_DT primary key (ID);
alter table DOCUMENT_ITEMS
add constraint FK_DOCUMENT_ITEMS_DT foreign key (DOC_ID)
references DOCUMENT (ID);
create table INVOICE
ID   NUMBER not null,
INVOICE_NO VARCHAR2(15)
alter table INVOICE
add constraint INVOICE_PK_ID primary key (ID);
INSERT INTO EMP ( ID, TYPE ) VALUES (
1, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
2, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
3, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
4, 'A');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
1, 1, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
2, 2, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
3, 3, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
4, 4, 'USA');
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
1, 1);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
2, 2);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
3, 3);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
4, 4);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
1, 'DOC1', 1);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
2, 'DOC1', 2);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
3, 'DOC3', 0);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
4, 'DOC4', 3);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
1, 1, 1);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
2, 2, 2);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
3, 2, 2);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
4, 3, 3);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
5, 4, 4);
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
1, 'INV1');
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
2, 'INV2');
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
3, 'INV3');
commit;
-- I have written below query to satisfy above conditions but still required results are not coming..
SELECT *
FROM EMP E
WHERE E.TYPE = 'A'
   AND NOT EXISTS (SELECT *
          FROM EMP_DOCS       EDOC1,
               EMP_DOCS       EDOC2,
               EMP            E1,
               EMP_ITEMS      EMPI,
               DOCUMENT_ITEMS DOCITM,
               DOCUMENT       DOC,
               INVOICE        INV
         WHERE EDOC1.EMP_ID = E.ID
           AND EDOC2.EMP_ID = E1.ID
           AND EDOC1.ID = EMPI.EMP_DOC_ID
           AND EDOC1.COUNTRY_NO = EDOC2.COUNTRY_NO
           AND EMPI.ID = DOCITM.EMP_ITEMS_REF_ID_1
           AND DOCITM.DOC_ID = DOC.ID
           AND INV.ID = DOC.INVOICE_REF_1);

DB version:oracle 10g;10.2

How to INSERT into table using CORRELATED subquery

I have 3 tables:
1.TEMP_PHONE(person_id, phonenumber, phone_type) - this holds all phone numbers relating to a person(just a temporary holding area)
2.PHONE_CONNECT(PERSON_ID, PHONE_ID) this table shows all the phone numbers relating to an individual. Phone_id is a unique number to identify a phonenumber and type(cell, work, home) - so in this table a person can have multiple phone ids)
3.MASTER_PHONE(PHONE_ID, PHONENUMBER, PHONE_TYPE) this is a master phone table. each combination of phone number and type has a unique identifier-phone_id.
What i need to figure out is how to populate PHONE_CONNECT with the information from TEMP_PHONE IF PERSON_ID already exists but phone_id is different. In other words, if the person gets a new phone number, i need to insert a new row into phone_connect.
Before that step is started, the master_phone is populated first with a new phone_id associated to the phonenumber/type
any help would be much appreciated. Thanks in advance.
So far, this is what i have come up with, but not sure if it makes sense:
insert into phone_connect(person_id)
select a.person_id
from temp_phone a
where
person_id = (select b.person_id from phone_connect b, master_phone c
where
a.person_id=b.person_id
and b.phone_id <> c.phone_id
and c.phonenumber||c.phone_type=a.phonenumber||a.phone_type);
update phone_connect c
set phone_id=(
select b.phone_id
from temp_phone a, master_phone b
where a.person_id = c.person_id
and a.phonenumber||a.phone_type = b.phonenumber||b.phone_type)
where phone_id is null;

It does. You are right. But that's what i need help with. I don't think my code is correct. After the insert, the code is actually updating the same exact record I just inserted. I'm sure this all can be done with one insert. I just really don't know how to show that in my code.
I need to insert a new record into phone_connect with person_id and phone_id. phone_id is already populated in master_phone. I guess my problem is how to go about creating the joins to all three tables to make sure im inserting the data correctly, or not inserting data that already exists.

Performance of using a Select For Update vs a correlated subquery

I was wondering wether or not it is more effecient to use the
Select ... For Update (with a cursor etc.) versus a correlated
subquery.
I can accomplish the same thing with either however performance
at our site is an issue.

Use select for update cursor as that is faster as it updates
based on the rowid. One thing to keep in mind is that rowid is
session specific and the rows to be updated get locked so that
nobody else can update them till the lock is released. I have
had very good performance results with these cursors.
Good luck !
Sudha

SQL Bug in "Minus" in correlated subquery presence of index (11.2.0.1.0)

SQL Bug in "Minus" in correlated subquery presence of index
(Oracle Database 11g Release 11.2.0.1.0)
Below, there is a small example that shows the bug. Further below,
there are some more comments.
drop table Country;
create table Country
(code VARCHAR2(4) constraint countrykey PRIMARY KEY,
name VARCHAR2(35));
-- if the key constraint is not given, the bug does not occur
drop table City;
create table City
(name VARCHAR2(35),
country VARCHAR2(4),
population number);
drop table Locatedon;
create table Locatedon
(city VARCHAR2(35),
country VARCHAR2(4),
island VARCHAR2(35));
insert into country values('E','Spain');
insert into country values('F','France');
insert into country values('S','Sweden');
insert into country values('GB','Sweden');
insert into city values('Ajaccio','F',53500);
insert into city values('Paris','F',2152423);
insert into city values('Palma','E',322008);
insert into city values('Madrid','E',3041101);
insert into city values('Stockholm','S',711119);
insert into city values('London','GB',6967500);
insert into locatedon values('Ajaccio','F','Corse');
insert into locatedon values('Palma','E','Mallorca');
insert into locatedon values('London','GB','Great Britain');
-- all countries that have a city that is not located on
-- some island: should be E, F, S.
Select c.name
From country c
Where exists
((Select name
From city
Where city.country=c.code)
minus
(Select city
From locatedon
Where locatedon.country=c.code)
-- wrong answer: only Sweden; Spain and France not in the answer!
select distinct country from
((Select name, country
From city)
minus
(Select city, country
From locatedon)
-- correct answer: E, F, S
Comments:
The bug has been found by students in our SQL course.
Using a larger database from that course, the bug can be reproduced
(same queries as above) at
http://www.semwebtech.org/sqlfrontend/
(wrong: 142 answers, correct: 154 answers)
During reducing it to a simple sample, there were some interesting
observations: trying with smaller and simpler tables (without the keys)
and synthetic data, the bug did not occur immediately. When
restating the query after about one day, the bug occurred. Obviously,
Oracle creates some index on its own in course of its internal
optimization that (or more exactly, its usage) exhibits the bug. The
query plan (showed in SQL Developer) was the same before and after.
Wolfgang

There's a typo in the test data - GB should presumably not be in Sweden. However....
the bug did not occur immediatelyIt's possible. But what would have almost certainly happened is that the execution plan DID change at some point. There are various reasons why it might not be immediate.
Obviously, Oracle creates some index on its own in course of its internal optimizationFar from obvious, what are you on about?
The query plan was the same before and afterBet you it wasn't.
A clear illustration of the issue and indication that it must be a bug is below.
Simply by hinting a different access method, we can change the result. Therefore, bug.
See [url http://support.oracle.com]Oracle Support and search for "wrong results".
Please raise with Oracle Support to get confirmation of bug.
There have been so many wrong results bugs recently, it's getting ridiculous.
It's a real issue, IMHO.
If you can't trust the DB to get your data right....
Note that the query plan is very much NOT the same and it is the difference in query plan which s that is the root cause of the bug.
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
SQL> SELECT c.name
2 FROM   country1 c
3 WHERE exists ((SELECT name
4                  FROM   city1
5                  WHERE city1.country=c.code)
6                  MINUS
7                 (SELECT city
8                  FROM   locatedon1
9                  WHERE locatedon1.country=c.code));
NAME
Sweden
SQL> SELECT /*+ full(c) */
2         c.name
3 FROM   country1 c
4 WHERE exists ((SELECT name
5                  FROM   city1
6                  WHERE city1.country=c.code)
7                  MINUS
8                 (SELECT city
9                  FROM   locatedon1
10                  WHERE locatedon1.country=c.code));
NAME
Spain
France
Sweden
SQL> explain plan for
2 SELECT c.name
3 FROM   country1 c
4 WHERE exists ((SELECT name
5                  FROM   city1
6                  WHERE city1.country=c.code)
7                  MINUS
8                 (SELECT city
9                  FROM   locatedon1
10                  WHERE locatedon1.country=c.code));
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 156929629
| Id | Operation                    | Name       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |            |     1 |    27 |    12 (25)| 00:00:01 |
|   1 | NESTED LOOPS                |            |       |       |            |          |
|   2 |   NESTED LOOPS               |            |     1 |    27 |    12 (25)| 00:00:01 |
|   3 |    VIEW                      | VW_SQ_1    |     6 |    24 |    10 (20)| 00:00:01 |
|   4 |     MINUS                    |            |       |       |            |          |
|   5 |      SORT UNIQUE             |            |     6 |   138 |            |          |
|   6 |       TABLE ACCESS FULL      | CITY1      |     6 |   138 |     4   (0)| 00:00:01 |
|   7 |      SORT UNIQUE             |            |     3 |    69 |            |          |
|   8 |       TABLE ACCESS FULL      | LOCATEDON1 |     3 |    69 |     4   (0)| 00:00:01 |
|* 9 |    INDEX UNIQUE SCAN         | COUNTRYKEY |     1 |       |     0   (0)| 00:00:01 |
| 10 |   TABLE ACCESS BY INDEX ROWID| COUNTRY1   |     1 |    23 |     1   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   9 - access("VW_COL_1"="C"."CODE")
Note
   - dynamic sampling used for this statement (level=4)
26 rows selected.
SQL> explain plan for
2 SELECT /*+ full(c) */
3         c.name
4 FROM   country1 c
5 WHERE exists ((SELECT name
6                  FROM   city1
7                  WHERE city1.country=c.code)
8                  MINUS
9                 (SELECT city
10                  FROM   locatedon1
11                  WHERE locatedon1.country=c.code));
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 1378726376
| Id | Operation            | Name       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT     |            |     1 |    23 |    14 (15)| 00:00:01 |
|* 1 | FILTER              |            |       |       |            |          |
|   2 |   TABLE ACCESS FULL | COUNTRY1   |     4 |    92 |     4   (0)| 00:00:01 |
|   3 |   MINUS              |            |       |       |            |          |
|   4 |    SORT UNIQUE       |            |     1 |    23 |     5 (20)| 00:00:01 |
|* 5 |     TABLE ACCESS FULL| CITY1      |     1 |    23 |     4   (0)| 00:00:01 |
|   6 |    SORT UNIQUE       |            |     1 |    23 |     5 (20)| 00:00:01 |
|* 7 |     TABLE ACCESS FULL| LOCATEDON1 |     1 |    23 |     4   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter( EXISTS ( (SELECT "NAME" FROM "CITY1" "CITY1" WHERE
              "CITY1"."COUNTRY"=:B1)MINUS (SELECT "CITY" FROM "LOCATEDON1" "LOCATEDON1"
              WHERE "LOCATEDON1"."COUNTRY"=:B2)))
   5 - filter("CITY1"."COUNTRY"=:B1)
   7 - filter("LOCATEDON1"."COUNTRY"=:B1)
Note
   - dynamic sampling used for this statement (level=4)
27 rows selected.Just to show that it's related to query transformation:
SQL> SELECT /*+
2             no_query_transformation
3         */
4         c.name
5 FROM   country1 c
6 WHERE exists ((SELECT name
7                  FROM   city1
8                  WHERE city1.country=c.code)
9                  MINUS
10                 (SELECT city
11                  FROM   locatedon1
12                  WHERE locatedon1.country=c.code));
NAME
Spain
France
Sweden
SQL> Edited by: Dom Brooks on Jun 30, 2011 2:50 PM

Top-n analysis in oracle 8i

How to use top-n analysis in oracle 8i?
I mean,take a example.
I am maintaining a database of a 1000 employees.I want to display the names of the employees who are getting top 10 salaries(more further top 100 salaries) using a SQL query in oracle 8i only.Please answer my problem.

Sorry, my suggestion will return 10 emp with highest salaries, not all employees with 10 highest salaries. To get all employees with 10 highest salaries in 8i:
SQL> SELECT ename,
2          sal
3    FROM emp
4    WHERE sal IN (
5                  SELECT sal
6                    FROM (
7                           SELECT sal
8                             FROM emp
9                             GROUP BY sal
10                             ORDER BY sal DESC
11                          )
12                    WHERE rownum <= 10
13                 )
14 /
ENAME             SAL
KING             5000
FORD             3000
SCOTT            3000
JONES            2975
BLAKE            2850
CLARK            2450
ALLEN            1600
TURNER           1500
MILLER           1300
MARTIN           1250
WARD             1250
ENAME             SAL
ADAMS            1100
12 rows selected.
SQL> SY.

BOM Performance Analysis using SAT or SE30 t-code?

Hi,
Currently I'm doing performance analysis of BOM to find out the bottlenecks. I'm doing the analysis using SAT or SE30 t-code.
From my understanding, BOM performance depends upon
1. no. of BOM items
2. BOM Level
3. BOM Evolution over time
Can anyone provide me a hint to find out the bottlenecks in BOM performance. Thanks!!
Regards,
Saravana

I have done the BOM Performance Analysis. Based on the most execution time and top performance consumers, please find my observations…
Functionally, Performance of BOM execution depends upon
Number of BOM items available in the BOM
Number of Assemblies present in the BOM
BOM Levels
BOM Evolution over time
Technically, BOM execution time is purely depends upon
fetching the data from the SAP tables
hitting the same table again and again when goes down the level
loop at the tables / Nested functions used in SAP Program
Hence, I'm closing this thread.....

What is Top-N analysis

What is Top-N analysis.?? can some one explain. I encountered this while going thru
the Sql book
The ORDER BY clause in the subquery is not
needed unless you are performing Top-N analysis.

That means you are doing something like this in order to get top five paid people::
SELECT * FROM
( SELECT empno, ename, sal+nvl(comm,0) as remuneration
FROM emp
ORDER BY remuneration DESC )
WHERE rownum <= 5
/We have to do the ORDER BY in a sub-query because rownum gets applied before the rows are sorted.
Cheers, APC

Performing Top-N Analysis

An Oracle University Material in Sql Says
The high-level structure of a Top-N analysis query is:
SELECT [column_list], ROWNUM
FROM (SELECT [column_list]
FROM table
ORDER BY Top-N_column)
WHERE ROWNUM <= N;
For example to display the top three earner names and salaries from the EMPLOYEES table:
SELECT ROWNUM as RANK, last_name, salary
FROM (SELECT last_name,salary FROM employees
ORDER BY salary DESC)
WHERE ROWNUM <= 3;
My question is
If, instead of this query, I write
1)
SELECT ROWNUM as RANK, last_name, salary
FROM employees
WHERE ROWNUM <= 3
ORDER BY salary DESC
or
2)
SELECT ROWNUM as RANK, last_name, salary
FROM ( SELECT last_name,salary
FROM employees
WHERE ROWNUM <= 3
ORDER BY salary DESC
is any difference?
The results in schema hr are the same.............
Thank you

is any difference? yes, there is!
SQL> with t as (select 1 num from dual union all
2             select 4 from dual union all
3             select 3 from dual union all
4             select 2 from dual)
5             --
6 SELECT ROWNUM as RANK, num
7    FROM (SELECT num FROM t ORDER BY num desc)
8   WHERE ROWNUM <= 3;
      RANK        NUM
         1          4
         2          3
         3          2
SQL>
SQL> with t as (select 1 num from dual union all
2             select 4 from dual union all
3             select 3 from dual union all
4             select 2 from dual)
5 --
6 SELECT ROWNUM as RANK, num
7    FROM t
8   WHERE ROWNUM <= 3
9   ORDER BY num DESC
10 /
      RANK        NUM
         2          4
         3          3
         1          1
SQL>
SQL> with t as (select 1 num from dual union all
2             select 4 from dual union all
3             select 3 from dual union all
4             select 2 from dual)
5 --
6 SELECT ROWNUM as RANK, num
7    FROM (SELECT num FROM t
8          WHERE ROWNUM <= 3
9          ORDER BY num DESC)
10 /
      RANK        NUM
         1          4
         2          3
         3          1
SQL> rownum is confered before ordering is made.
Thats why you should place the subquery with ordering in the inline view.

JDOQL Correlated Subquery - Bad SQL

Hi,
When I execute a JDOQL correlated subquery, the generated SQL is either
invalid or incorrect. Exactly what happens depends on the exact query, and
on the target database type, but I believe it all stems from the same
problem, which has to do with table aliasing.
If you need further details to reproduce this, please let me know. I'll be
glad to help in any way I can to get this situation remedied quickly, as I
am depending on this functionality. I have a test application to
demonstrate the problem.
I'm using Kodo 3.3.3 and application identity.
Paul Mogren
CommerceHub

For the record, this is in part due to a bug in Kodo's SQL92 joining.
See http://bugzilla.solarmetric.com/show_bug.cgi?id=1156
-Patrick
Paul Mogren wrote:
Certainly... Here's a simple example using Microsoft's JDBC Driver for SQL
Server 2000, and kodo.jdbc.sql.SQLServerDictionary, which produces invalid
SQL.
The query:
pm.newQuery(Container.class,
"(select from Entry entry where entries.contains(entry) &&
entry.containedId != 1).isEmpty()");
The classes:
class Contained {
private int id; //pk
class Container {
private int id; //pk
private Set entries = new HashSet(); //<Entry>
class Entry {
private int containerId; //pk
private int containedId; //pk
private Container container; //persistent-redundant
private Contained contained; //persistent-redundant
The result:
Incorrect syntax near the keyword 'WHERE'. {prepstmnt 31598780 SELECT
t0.container_id, t0.lock FROM WHERE (NOT EXISTS (SELECT DISTINCT
t2.contained_id, t2.container_id FROM dbo.entry t2 WHERE (t1.contained_id
= t2.contained_id AND t1.container_id = t2.container_id AND
t2.contained_id <> ?) AND t0.container_id = t1.container_id))
[params=(int) 1]} [code=156, state=HY000]
Patrick Linskey wrote:
Hi Paul,
Kodo's correlated subquery support does have some known limitations. Can
you post a sample JDOQL statement + corresponding SQL statement?
-Patrick
Paul Mogren wrote:
Hi,
When I execute a JDOQL correlated subquery, the generated SQL is either
invalid or incorrect. Exactly what happens depends on the exact query, and
on the target database type, but I believe it all stems from the same
problem, which has to do with table aliasing.
If you need further details to reproduce this, please let me know. I'll be
glad to help in any way I can to get this situation remedied quickly, as I
am depending on this functionality. I have a test application to
demonstrate the problem.
I'm using Kodo 3.3.3 and application identity.
Paul Mogren
CommerceHub

Getting Top N Value using SQL

There are thousands of records in a table. The table has column TOTAL_NUMBER. I want to find the top 3rd using the column TOTAL_NUMBER. How can I do this using SQL?

Google:
Using RANK() to Obtain a Top-N Query
To obtain a top-N query, use RANK() in a subquery and then apply a filter condition outside the subquery:
SELECT Empno, Ename, Job, Mgr, Hiredate, Sal
FROM
(SELECT Empno, Ename, Job, Mgr, Hiredate, Sal,
RANK() OVER
(ORDER BY SAL Desc NULLS LAST) AS Emp_Rank
FROM Emp
ORDER BY SAL Desc NULLS LAST)
WHERE Emp_Rank < 6;

How does oracle execute a correlated subquery .... some confusion

How does oracle 10g execute a correlated subquery?
I read some articles online & i am a little confused.
example:
select * from emp e
where e.deptno in (select d.deptno from dept d
where e.deptno = d.deptno);
My questions .......
1.In the above example, does oracle read the entire outer table first and then run the inner query using the rows returned by the outer query?
I read in some articles that they execute simultaneously.
How does this work?
2.Should the inner query have lesser amount of rows compared to the outer query for a good performance?
3.Can every correlated subquery be converted to a join and if so which one to use?
Truly appreciate any inputs on how oracle executes it at the backend.
Thanks in advance.

user10541890 wrote:
How does oracle 10g execute a correlated subquery?
I read some articles online & i am a little confused.
example:
select * from emp e
where e.deptno in (select d.deptno from dept d
where e.deptno = d.deptno);
My questions .......
1.In the above example, does oracle read the entire outer table first and then run the inner query using the rows returned by the outer query?
I read in some articles that they execute simultaneously.
How does this work?SQL is not a procedural language. SQL code specifies what the system sill do, not how the system wlll do it; that's entirely up to the system.
What does it matter to you whether the two are done together, or if one is completed before the other begins?
The system will probably choose to run ucorellated subqueiris only once, and correlated queries multiple times as needed.
2.Should the inner query have lesser amount of rows compared to the outer query for a good performance?That usually doesn't matter.
It some cases, you may want to consider whether the subquery is correlated or not. If the subquery is very costly, and produces, say, 1 million rows, but you know the main query will only produce about 5 rows, then you may want to do a correlated subquery rather than an uncorrelated one.
3.Can every correlated subquery be converted to a join and if so which one to use?I believe so.
Use whichever is easier to code and debug. That will change depnding on the data and the requirements.
If performance is an issue, try different ways. Usually, where I've noticed a big difference, join was fastest.
By the way, it's unusual to have a correlated IN-subquery.
Usually IN-subqueris are uncorrelated, like this:
select *
from      emp     e
where     e.deptno     in ( select d.deptno
                    from    dept     d
                  );(This and the queries below produce the same resutls as your original query.)
Correlated subqueries are usually used for scalar subqueries or EXISTS subqueries, like this:
select *
from      emp     e
where     EXISTS ( select d.deptno
           from    dept     d
                where   e.deptno = d.deptno
            );To do the same thing with a join:
select e.*
from      emp     e
join     dept     d     on     e.deptno     = d.deptno
;assuming dept.deptno is unique.

Generated a report which gives PR(Purchase Requisition) analysis using ALV.

hi experts,
please give me tables and fields for following report, and also exlain me briefly,
Generated a report which gives PR(Purchase Requisition) analysis using ALV.
thanks in advance,
radhakrishna

Hi
please find this report which link SO PO PR and Prd Ord and there status.
>
REPORT z_so_info.
TABLES: vbak, vbap, afko, afpo.
*Field catalog
TYPE-POOLS: slis.
DATA: lv_repid TYPE sy-repid VALUE sy-repid,
xfield TYPE slis_t_fieldcat_alv,
afield TYPE slis_fieldcat_alv.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN COMMENT 1(25) text-002.
SELECT-OPTIONS: so_so FOR vbak-vbeln OBLIGATORY.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME TITLE text-003.
PARAMETERS:
p_kunnr LIKE vbak-kunnr, " sold-to
p_kunwe LIKE vbak-kunnr. " ship-to
SELECTION-SCREEN END OF BLOCK b2.
*Constants
CONSTANTS: c_zor TYPE vbak-auart VALUE 'ZOR',
c_we TYPE vbpa-parvw VALUE 'WE',
c_ag TYPE vbpa-parvw VALUE 'AG'.
c_space TYPE space.
*Ranges
RANGES: ra_parvw FOR vbpa-parvw,
ra_kunnr FOR vbpa-kunnr.
*Tables
DATA: BEGIN OF gt_output OCCURS 0,
vbeln LIKE vbak-vbeln, " sales order number
posnr LIKE vbap-posnr, " SO item number
matnr LIKE vbap-matnr, " material number
sh LIKE vbpa-kunnr, " Ship-to
sp LIKE vbpa-kunnr, " Sold-to
lifnr LIKE ekko-lifnr, " Vendor
bstnk LIKE vbak-bstnk, " PO number
banfn LIKE vbep-banfn, " Purchase requi
po_st TYPE char30, " PO status text
pstyv TYPE vbap-pstyv, " Item catagory
aufnr LIKE afpo-aufnr, " Production Order
prd_stat TYPE string, " Prd order status
END OF gt_output.
DATA: wa_output LIKE gt_output.
FIELD-SYMBOLS: <fs_output> LIKE gt_output.
*Table for sales order and PO
TYPES : BEGIN OF gs_data,
vbeln TYPE vbak-vbeln,
posnr TYPE vbap-posnr,
pstyv TYPE vbap-pstyv,
matnr TYPE vbap-matnr,
END OF gs_data.
DATA: gt_data TYPE STANDARD TABLE OF gs_data,
wa_data TYPE gs_data.
*Table for Production Orders
TYPES: BEGIN OF gs_prd,
aufnr TYPE afpo-aufnr,
posnr TYPE afpo-posnr,
kdauf TYPE afpo-kdauf,
kdpos TYPE afpo-kdpos,
wepos TYPE afpo-wepos, "Goods Receipt Indicator
elikz TYPE afpo-elikz, "Delivery Completed Indicator
objnr TYPE aufk-objnr, "Object number
getri TYPE afko-getri, "Confirmed Order Finish Date
gltri TYPE afko-gltri, "Actual finish date
END OF gs_prd.
DATA: gt_prd TYPE STANDARD TABLE OF gs_prd,
wa_prd TYPE gs_prd.
*Table for partner data
TYPES: BEGIN OF gs_partner,
vbeln TYPE vbak-vbeln,
posnr TYPE vbap-posnr,
parvw TYPE vbpa-parvw,
kunnr TYPE vbpa-kunnr,
END OF gs_partner.
DATA: gt_partner TYPE STANDARD TABLE OF gs_partner,
wa_partner TYPE gs_partner.
TYPES: BEGIN OF gs_po,
ebeln TYPE ekkn-ebeln,
ebelp TYPE ekkn-ebelp,
vbeln TYPE ekkn-vbeln,
vbelp TYPE ekkn-vbelp,
END OF gs_po.
DATA: gt_po TYPE STANDARD TABLE OF gs_po,
wa_po TYPE gs_po.
TYPES: BEGIN OF gs_preq,
vbeln TYPE vbep-vbeln,
posnr TYPE vbep-posnr,
banfn TYPE vbep-banfn,
END OF gs_preq.
DATA: gt_preq TYPE STANDARD TABLE OF gs_preq,
wa_preq TYPE gs_preq.
TYPES: BEGIN OF gs_po_stat,
ebeln TYPE ekko-ebeln,
procstat TYPE ekko-procstat,
lifnr TYPE ekko-lifnr,
END OF gs_po_stat.
DATA: gt_po_stat TYPE STANDARD TABLE OF gs_po_stat,
wa_po_stat TYPE gs_po_stat.
*Field symbols
FIELD-SYMBOLS: <fs> TYPE tj02t-txt04,
<fs_temp> TYPE tj02t-txt04,
<fs_stat> TYPE char30.
START-OF-SELECTION.
PERFORM fr_build_range.
PERFORM fr_get_data.
PERFORM fr_build_fc.
PERFORM fr_output.
*& Form fr_get_data
text
--> p1 text
<-- p2 text
FORM fr_get_data.
*Get SO
SELECT avbeln aposnr apstyv amatnr
FROM vbap AS a
JOIN vbak AS b
ON avbeln = bvbeln
JOIN vbpa AS c
ON bvbeln = cvbeln
INTO TABLE gt_data
WHERE b~vbeln IN so_so
AND b~auart EQ c_zor "Only Sales Orders
AND c~kunnr IN ra_kunnr. "from selection screen
DELETE ADJACENT DUPLICATES FROM gt_data COMPARING vbeln posnr.
*get data of the production order
IF NOT gt_data[] IS INITIAL.
SELECT aaufnr aposnr akdauf akdpos awepos aelikz
b~objnr
FROM afpo AS a
JOIN aufk AS b
ON aaufnr = baufnr
INTO TABLE gt_prd
FOR ALL ENTRIES IN gt_data
WHERE a~kdauf EQ gt_data-vbeln
AND a~kdpos EQ gt_data-posnr.
ENDIF.
*Get partner data
IF NOT gt_data[] IS INITIAL.
SELECT vbeln posnr parvw kunnr
FROM vbpa
INTO TABLE gt_partner
FOR ALL ENTRIES IN gt_data
WHERE vbeln EQ gt_data-vbeln.
ENDIF.
*Get Purchase Order
IF NOT gt_data[] IS INITIAL.
SELECT ebeln ebelp vbeln vbelp
FROM ekkn
INTO TABLE gt_po
FOR ALL ENTRIES IN gt_data
WHERE vbeln EQ gt_data-vbeln
AND vbelp EQ gt_data-posnr.
SELECT vbeln posnr banfn
FROM vbep
INTO TABLE gt_preq
FOR ALL ENTRIES IN gt_data
WHERE vbeln EQ gt_data-vbeln
AND posnr EQ gt_data-posnr.
ENDIF.
IF NOT gt_po[] IS INITIAL.
SELECT aebeln aprocstat a~lifnr
FROM ekko AS a
JOIN ekpo AS b
ON aebeln = bebeln
INTO TABLE gt_po_stat
FOR ALL ENTRIES IN gt_po
WHERE b~ebeln EQ gt_po-ebeln
AND b~ebelp EQ gt_po-ebelp.
ENDIF.
*Move data to output table
LOOP AT gt_data INTO wa_data.
wa_output-vbeln = wa_data-vbeln.
wa_output-posnr = wa_data-posnr.
wa_output-pstyv = wa_data-pstyv.
wa_output-matnr = wa_data-matnr.
READ TABLE gt_po INTO wa_po WITH KEY vbeln = wa_data-vbeln
vbelp = wa_data-posnr.
IF sy-subrc EQ 0.
wa_output-bstnk = wa_po-ebeln.
READ TABLE gt_po_stat INTO wa_po_stat WITH KEY ebeln = wa_po-ebeln.
IF sy-subrc EQ 0.
wa_output-lifnr = wa_po_stat-lifnr.
CASE wa_po_stat-procstat.
WHEN '01'.
wa_output-po_st = 'Version in process'.
WHEN '02'.
wa_output-po_st = 'Active'.
WHEN '03'.
wa_output-po_st = 'In release'.
WHEN '04'.
wa_output-po_st = 'Partially released'.
WHEN '05'.
wa_output-po_st = 'Released Completely'.
WHEN '08'.
wa_output-po_st = 'Rejected'.
ENDCASE.
ENDIF. "inner read subrc
ENDIF. "outer read subrc
READ TABLE gt_preq INTO wa_preq WITH KEY vbeln = wa_data-vbeln
posnr = wa_data-posnr.
IF sy-subrc EQ 0.
wa_output-banfn = wa_preq-banfn.
ENDIF.
READ TABLE gt_prd INTO wa_prd WITH KEY kdauf = wa_data-vbeln
kdpos = wa_data-posnr.
IF sy-subrc EQ 0.
wa_output-aufnr = wa_prd-aufnr.
*get the purchase requisition for production order as well
SELECT SINGLE banfn
FROM ebkn
INTO wa_output-banfn
WHERE aufnr EQ wa_prd-aufnr.
*Get the status of the production order
PERFORM fr_get_prd_stat USING wa_prd-objnr
CHANGING wa_output-prd_stat.
ENDIF. " sy-subrc
READ TABLE gt_partner INTO wa_partner WITH KEY vbeln = wa_data-vbeln
parvw = c_we.
IF sy-subrc EQ 0.
wa_output-sh = wa_partner-kunnr.
ENDIF.
READ TABLE gt_partner INTO wa_partner WITH KEY vbeln = wa_data-vbeln
parvw = c_ag.
IF sy-subrc EQ 0.
wa_output-sp = wa_partner-kunnr.
ENDIF.
APPEND wa_output TO gt_output.
CLEAR: wa_data, wa_prd,wa_partner,wa_output.
ENDLOOP.
ENDFORM. " fr_get_data
*& Form fr_build_range
text
--> p1 text
<-- p2 text
FORM fr_build_range .
*Range for partner function
MOVE 'I' TO ra_parvw-sign.
MOVE 'EQ' TO ra_parvw-option.
MOVE 'SH' TO ra_parvw-low. " we
APPEND ra_parvw.
CLEAR ra_parvw.
MOVE 'I' TO ra_parvw-sign.
MOVE 'EQ' TO ra_parvw-option.
MOVE 'SP' TO ra_parvw-low. " ag
APPEND ra_parvw.
CLEAR ra_parvw.
*Range for ship-to and sold-to
MOVE 'I' TO ra_kunnr-sign.
MOVE 'EQ' TO ra_kunnr-option.
MOVE p_kunnr TO ra_kunnr-low.
APPEND ra_kunnr.
CLEAR ra_kunnr.
MOVE 'I' TO ra_kunnr-sign.
MOVE 'EQ' TO ra_kunnr-option.
MOVE p_kunwe TO ra_kunnr-low.
APPEND ra_kunnr.
CLEAR ra_kunnr.
ENDFORM. " fr_build_range
*& Form fr_build_fc
text
--> p1 text
<-- p2 text
FORM fr_build_fc .
sales order number
afield-fieldname = 'VBELN'.
afield-seltext_s = 'Sales #'.
afield-ref_tabname = 'VBAK'.
APPEND afield TO xfield. CLEAR afield.
sales ITEM number
afield-fieldname = 'POSNR'.
afield-seltext_s = 'Item #'.
afield-ref_tabname = 'VBAP'.
APPEND afield TO xfield. CLEAR afield.
Material Number
afield-fieldname = 'MATNR'.
afield-seltext_s = 'Material #'.
afield-ref_tabname = 'VBAP'.
afield-outputlen = 10.
APPEND afield TO xfield. CLEAR afield.
*Vendor Number
afield-fieldname = 'LIFNR'.
afield-seltext_s = 'Vendor Num.'.
afield-ref_tabname = 'EKKO'.
APPEND afield TO xfield. CLEAR afield.
ship-to-party
afield-fieldname = 'SH'.
afield-seltext_s = 'Ship-to'.
afield-ref_tabname = 'VBPA'.
APPEND afield TO xfield. CLEAR afield.
sold-to-party
afield-fieldname = 'SP'.
afield-seltext_s = 'Sold-to'.
afield-ref_tabname = 'VBPA'.
APPEND afield TO xfield. CLEAR afield.
*PO number
afield-fieldname = 'BSTNK'.
afield-seltext_s = 'PO NUM'.
afield-ref_tabname = 'EKKO'.
APPEND afield TO xfield. CLEAR afield.
*PO status
afield-fieldname = 'PO_STAT'.
afield-seltext_s = 'Step'.
afield-ref_tabname = 'zbacklog_v2'.
APPEND afield TO xfield. CLEAR afield.
*PO step status
afield-fieldname = 'PO_ST'.
afield-seltext_s = 'PO.Status'.
afield-ref_tabname = 'zbacklog_v2'.
APPEND afield TO xfield. CLEAR afield.
*Purchase requisition
afield-fieldname = 'BANFN'.
afield-seltext_s = 'Pur. Req.'.
afield-ref_tabname = 'VBEP'.
APPEND afield TO xfield. CLEAR afield.
*Item catagory
afield-fieldname = 'PSTYV'.
afield-seltext_s = 'Itm. Catg'.
afield-ref_tabname = 'VBAP'.
APPEND afield TO xfield. CLEAR afield.
*Prodcution Order number
afield-fieldname = 'AUFNR'.
afield-seltext_m = 'Prod.Order'.
afield-ref_tabname = 'AFKO'.
APPEND afield TO xfield. CLEAR afield.
*PRODCUTION status
afield-fieldname = 'PRD_STAT'.
afield-seltext_s = 'Prd. Step'.
afield-ref_tabname = 'zbacklog_v2'.
afield-outputlen = 20.
APPEND afield TO xfield. CLEAR afield.
*PRODUCTION step status
afield-fieldname = 'PRD_ST'.
afield-seltext_s = 'Prd. Status'.
afield-ref_tabname = 'zbacklog_v2'.
APPEND afield TO xfield. CLEAR afield.
ENDFORM. " fr_build_fc
*& Form fr_output
text
--> p1 text
<-- p2 text
FORM fr_output .
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
i_callback_program = sy-repid
I_CALLBACK_PF_STATUS_SET = ' '
I_CALLBACK_USER_COMMAND = ' '
I_STRUCTURE_NAME =
IS_LAYOUT =
it_fieldcat = xfield[]
i_default = 'X'
i_save = 'A'
TABLES
t_outtab = gt_output
EXCEPTIONS
program_error = 1
OTHERS = 2.
ENDFORM. " fr_output
*& Form fr_get_prd_stat
text
-->P_WA_PRD_OBJNR text
FORM fr_get_prd_stat USING p_objnr CHANGING p_prd_stat.
DATA: lt_status TYPE STANDARD TABLE OF jstat,
wa_status TYPE jstat,
lv_status TYPE tj02t-txt04,
lv_temp2 TYPE char5,
lv_buff TYPE string.
CALL FUNCTION 'STATUS_READ'
EXPORTING
client = sy-mandt
objnr = p_objnr
only_active = 'X'
TABLES
status = lt_status
EXCEPTIONS
object_not_found = 1
OTHERS = 2.
LOOP AT lt_status INTO wa_status.
IF wa_status-stat(1) EQ 'I'.
SELECT txt04 FROM tj02t
INTO lv_status
WHERE istat EQ wa_status-stat
AND spras EQ 'E'.
ENDSELECT.
lv_temp2 = lv_status.
CONCATENATE lv_temp2 p_prd_stat INTO p_prd_stat
SEPARATED BY ','.
ENDIF.
CLEAR: wa_status, lv_status, lv_temp2.
ENDLOOP.
lv_buff = p_prd_stat.
*Status of Production Order
IF lv_buff CS 'CRTD'.
p_prd_stat = 'Not Active'.
ENDIF.
IF lv_buff CS 'REL'.
IF lv_buff CS 'GMPS'.
p_prd_stat = 'Printed In Prod'.
ELSE.
p_prd_stat = 'Printed'.
ENDIF.
ENDIF.
IF lv_buff CS 'TECO'.
p_prd_stat = 'Technically Compt.'.
ENDIF.
ENDFORM. " fr_get_prd_stat
>

Allignment in ALV top of page using oops

I am displaying some fields with their values on top of page using Classes.but i am not able to get a proper alignment.
i want the field and their respective values one-below the other with once the field description and the values below after the description. eg...
field : 0125465
           0123654
           23654100
sales : au01
           sd02
           GH26
org    : 101
           102
           103

Check this sample..
Take the code from the HTML_TOP_OF_PAGE from the below report.
REPORT ztest_page.
DATA : it_flight TYPE TABLE OF sflight WITH HEADER LINE.
data: t type x.
START-OF-SELECTION.
SELECT * FROM sflight INTO TABLE it_flight.
END-OF-SELECTION.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program          = sy-repid
      i_callback_html_top_of_page = 'HTML_TOP_OF_PAGE'
      i_callback_top_of_page      = 'TOP_OF_PAGE'
      i_structure_name            = 'SFLIGHT'
    TABLES
      t_outtab                    = it_flight
    EXCEPTIONS
      program_error               = 1
      OTHERS                      = 2.
*&      Form TOP_OF_PAGE
*       text
FORM top_of_page.
WRITE 'This is the Top of page which triggers in print'.
ENDFORM.                    "TOP_OF_PAGE
*&      Form html_top_of_page
FORM html_top_of_page USING document TYPE REF TO cl_dd_document.
DATA : dl_text(255) TYPE c. "Text
* Add new-line
CALL METHOD document->new_line.
CALL METHOD document->new_line.
CLEAR : dl_text.
* program ID
dl_text = 'Program Name :'.
CALL METHOD document->add_gap.
CALL METHOD document->add_text
    EXPORTING
      text         = dl_text
      sap_emphasis = cl_dd_area=>heading
      sap_color    = cl_dd_area=>list_heading_int.
CLEAR dl_text.
dl_text = sy-repid.
CALL METHOD document->add_text
    EXPORTING
      text         = dl_text
      sap_emphasis = cl_dd_area=>heading
      sap_color    = cl_dd_area=>list_negative_inv.
* Add new-line
CALL METHOD document->new_line.
CLEAR : dl_text.
dl_text = sy-uname.
CALL METHOD document->add_gap
    EXPORTING
      width = 34.
CALL METHOD document->add_text
    EXPORTING
      text         = dl_text
      sap_emphasis = cl_dd_area=>heading
      sap_color    = cl_dd_area=>list_negative_inv.
* Add new-line
CALL METHOD document->new_line.
CLEAR : dl_text.
CALL METHOD document->add_gap
    EXPORTING
      width = 34.
* Move date
WRITE sy-datum TO dl_text.
CALL METHOD document->add_text
    EXPORTING
      text         = dl_text
      sap_emphasis = cl_dd_area=>heading
      sap_color    = cl_dd_area=>list_negative_inv.
* Add new-line
CALL METHOD document->new_line.
CLEAR : dl_text.
* Move time
WRITE sy-uzeit TO dl_text.
CALL METHOD document->add_gap
    EXPORTING
      width = 34.
CALL METHOD document->add_text
    EXPORTING
      text         = dl_text
      sap_emphasis = cl_dd_area=>heading
      sap_color    = cl_dd_area=>list_negative_inv.
* Add new-line
CALL METHOD document->new_line.
ENDFORM.                    "HTML_TOP_OF_PAGE
same Code can be used in the class. you take the above code and see..

Top n Analysis using correlated subquery

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