Using ROWNUM to split a job in half?

Hi everyone,
I have a cursor in which I would like to only select half of the data so that this job can be run in two seperate jobs rather than one large one.
What is the best way to try this?
CURSOR C_POPULATE IS
SELECT TABLE1.ID, TABLE1.CODE, TABLE1.AMT
FROM TABLE1, TABLE2
WHERE TABLE2.TAB1_ID = TABLE1.IDTABLE2 has an unknown number of TAB1_ID's but only half of them should be selected. These IDs are not in sequence as they are a subgroup of TABLE1.ID taken using a different statement.
This doesn't work, I know, but something like this added on the end of the cursor:
AND ROWNUM <= (SELECT CEIL((MAX(ROWNUM)/2)) FROM TABLE2)I know that doesn't work, I'm just using it as an example to show what I mean. Then the second job would be ROWNUM >= etc...
IS this even going to be possbile using ROWNUM at all? I don't think so.
What about finding this value - CEIL((MAX(ROWNUM)/2)) - and then putting it in a variable, having a count on every update and putting EXIT WHEN COUNT = V_HALF_ROWNUM?
If that would work, how would I go about starting the second job?
Thanks anyone,
fakelvis

Maybe this thread will help ...
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:10498431232211
C.

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How to use ROWNUM in query

There are 1000 records in the employee table.I need to display 50 records each time by the order of the employees' names. In order to get the employee records from the 51st to the 100nd in the table, I tried to use ROWNUM.
However, the following query doesn't do the job:
select first_name, last_name from employee where rownum < 101 and rownum >49 order by last_name, first_name
I currently use the following query:
select * from (
(select first_name, last_name from employee where rownum < 101 order by last_name, first_name)
Minus
(select first_name, last_name from employee where rownum < 50 order by last_name, first_name )
) order by 2,1
The query works but is quite complictated. I would like to know if there a simpler way to do so.
Thanks in advance.
Helena

The generally preferred query is something along the lines of
SELECT *
FROM ( SELECT a.*, rownum rn
FROM (<<your query>>) a
WHERE rownum <= <<MAX VALUE>>)
WHERE rn >= <<MIN VALUE>><<your query>> here would be
SELECT first_name, last_name
FROM employee
ORDER BY first_name, last_nameNote that if you wanted to use the MINUS construct, you would generally need to move the rownum clause outside the query that is doing the ORDER BY. The query
SELECT first_name, last_name
FROM employee
WHERE rownum < 101
ORDER BY first_name, last_namefetches the first 100 rows and then orders them, which is not generally what you want.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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Issue with complete refresh on materialized view when using rownum

Hi all,
I had an issue with rownum when using complete refresh
I am using rownum when creating materialized view and it is generation correctly.But the issue was when i am refreshing the same ,rownum was not getting sorted in ascending order.
anyone had come across this scenario

rownum is determined as the row is output, so "order by rownum" does literally nothing.
http://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns009.htm

Select a range of rows to be displayed using ROWNUM

I am trying to select a range of records to be displayed using Rownum
It works using MINUS
SQL> select rownum,department_id,department_name from departments where rownum <= 20
minus
select rownum,department_id,department_name from departments where rownum < 11;
but does not work if a range is specified
select rownum,department_id,department_name from departments where rownum >= 11 and rownum <= 20;
What has gone wrong?
Details of what I have tried are as follows:
Connect to the sample schema HR
SQL> connect hr/hr
SQL> desc departments
Name Null? Type
DEPARTMENT_ID NOT NULL NUMBER(4)
DEPARTMENT_NAME NOT NULL VARCHAR2(30)
MANAGER_ID NUMBER(6)
LOCATION_ID NUMBER(4)
List all records in Departments
SQL> select rownum,department_id,department_name from departments;
ROWNUM DEPARTMENT_ID DEPARTMENT_NAME
1 10 Administration
2 20 Marketing
3 30 Purchasing
4 40 Human Resources
etc......
26 260 Recruiting
27 270 Payroll
27 rows selected.
List the first 10 records in DEPARTMENTS
SQL> select rownum,department_id,department_name from departments where rownum <= 10;
ROWNUM DEPARTMENT_ID DEPARTMENT_NAME
1 10 Administration
2 20 Marketing
etc.....
10 100 Finance
List row number from 11 to 20, but cannot no rows selected. Why?
SQL> select rownum,department_id,department_name from departments where rownum >= 11 and rownum <= 20;
no rows selected
Use of MINUS can retrieve row number from 11 to 20
SQL> select rownum,department_id,department_name from departments where rownum <= 20
minus
select rownum,department_id,department_name from departments where rownum < 11;
ROWNUM DEPARTMENT_ID DEPARTMENT_NAME
11 110 Accounting
12 120 Treasury
13 130 Corporate Tax
14 140 Control And Credit
15 150 Shareholder Services
16 160 Benefits
17 170 Manufacturing
18 180 Construction
19 190 Contracting
20 200 Operations
10 rows selected.

For each row returned by a query, the ROWNUM pseudocolumn returns a number indicating the order in which Oracle selects the row from a table or set of joined rows. The first row selected has a ROWNUM of 1, the second has 2, and so on.
Conditions testing for ROWNUM values greater than a positive integer are always false. For example, this query returns no rows:
SELECT * FROM employees
WHERE ROWNUM > 1;
You can get the selected records based on the rownum using the inline query....
SQL> select rownum, empno from emp;
ROWNUM EMPNO
1 7369
2 7499
3 7521
4 7566
5 7654
6 7698
7 7782
8 7788
9 7839
10 7844
11 7876
ROWNUM EMPNO
12 7900
13 7902
14 7934
14 rows selected.
SQL> select * from (select rownum rn, empno from emp) where rn > 2 and rn < 5;
RN EMPNO
3 7521
4 7566

Needs help to retrive the last row in a select query without using rownum

Hi ,
i need to retrive the last row from the select sub query without using rownum.
is there any other way to retrive the last row other than the below query.
is that the ROWNUM=1 will always retrive the 1 row of the select query ?
select from*
*(select ename from employee where dept_id=5 order by desc) where rownum=1;*
Please advise.
thanks for your help advance,
regards,
Senthur

957595 wrote:
Actually my problem is ithat while selecting the parents hiearchy of the child data using
CONNECT BY PRIOIR query
I need the immediate parent of my child data.
For example my connect BY query returns
AAA --- ROOT
BBB --PARENT -2
CCC --PARENT-1
DDD IS my input child to the connect by query
Immediate parent of my child data "DDD" ---> CCC(parent -1)
i want the data "CCC" from the select query,for that i am taking the last row of the query with rownum.
I got to hear that using ROWNUM to retrive the data will leads to some problem.It is a like a magic number.I am not sure what the problem will be.
So confusing with using this rownum in my query.
Please advice!!!It's not quite clear what you're wanting, but perhaps this may help?
you can select the PRIOR values to get the parent details if you want...
SQL> ed
Wrote file afiedt.buf
1 select empno, lpad(' ',(level-1)*2,' ')||ename as ename, prior empno as mgr
2 from emp
3 connect by mgr = prior empno
4* start with mgr is null
SQL> /
     EMPNO ENAME                                 MGR
      7839 KING
      7566   JONES                              7839
      7788     SCOTT                            7566
      7876       ADAMS                          7788
      7902     FORD                             7566
      7369       SMITH                          7902
      7698   BLAKE                              7839
      7499     ALLEN                            7698
      7521     WARD                             7698
      7654     MARTIN                           7698
      7844     TURNER                           7698
      7900     JAMES                            7698
      7782   CLARK                              7839
      7934     MILLER                           7782
14 rows selected.(ok, not the best of examples as the mgr is already known for a row, but it demonstrates you can select prior data)

Using rownum in EJB-QL ..Pagination using CMP 2.1

Hi ,
Hope this is the right forum .. rather than JDBC .
My requirement is to implement Pagination using EJB2.1 on weblogic with Oracle DB. This is for an application which is quite old system and is not ready yet to be migrated to EJB3.0. So we are struck with EJB2.1 at the moment.
We are using EJB-QL to get Search result and now need to add Pagination logic in it. I can find weblogic.ejb.PreparedQuery.setMaxElements() API to specify the upper limit but what am looking for is a lower limit ..somthing like setFirstRow() ..
Can it be done using CMP Entity Bean 2.1 .. EJBQL or someother way ?
I have the sql for pagination but am not sucessful in translating it to EJB-QL
select * from
select /*+ FIRST_ROWS(n) */ a.*, ROWNUM rnum from
(your_query_goes_here) a
where ROWNUM <=:MAX_ROW_TO_FETCH
where rnum >= :MIN_ROW_TO_FETCH;
Thanks in advance ! I hope I get a solution soon ..
Edited to get some answers !!!
is it possible to use rownum in EJBQL ? I know rownum is specific to Oracle and my application will stay with Oracle. I get this exception
"EJB QL compilation encountered error: [EJB:013042]The Identifier 'rownum' is neither a cmp-field nor a cmr-field. Re-examine your query."
Edited by: user11305835 on Oct 12, 2009 10:48 PM

Beevin
Both two are not even validated,
but with the first one as select max(c.id) from customer as c , in this case it is validated but while deploying it is error as , object must be return
But when i saw the ejb2.1 specification we can write this type of queries also ?
Is it problem with was any thing
Regards
Somaraju

Issue While executing the Query for Pagination using ROWNUM with like

Issue While executing the Query for Pagination using ROWNUM with like.
Database is Oracle11G.
Oracle Database Table contains 8-9 lakh records
1) SQL equal (=)
SELECT /*+ FIRST_ROWS(n) */ ROWNUM RNUM, A.* FROM LINE A
WHERE A.REFERENCE = 'KMF22600920'
Execution Time:- 0.00869245 seconds
Returns 2 resultsets
2) SQL like (one %)
SELECT /*+ FIRST_ROWS(n) */ ROWNUM RNUM, A.* FROM LINE A
WHERE A.REFERENCE = 'KMF22600920%'
Execution Time:- 0.01094301 seconds
Returns 2 resultsets
3) SQL like (two%)
SELECT /*+ FIRST_ROWS(n) */ ROWNUM RNUM, A.* FROM LINE A
WHERE A.REFERENCE like '%KMF22600920%'
Execution Time:- 6.43989658 seconds
Returns 2 resultsets
In Pagination, we are using Modified version of SQL Query 3) with ROWNUM as mentioned below :-
4) SELECT * FROM (
SELECT /*+ FIRST_ROWS(n) */ ROWNUM RNUM, A.* FROM LINE A
WHERE REFERENCE like '%KMF22600920%' AND ROWNUM <= 20 ) WHERE RNUM > 0
Execution Time:- Infinite
ResultSets:- No as execution time is infinite
a) Instead of like if we use = in the above query it is returning the 2 resultsets (execution time 0.02699282 seconds)
b) Instead of two % in the above query, if use one example REFERENCE like 'KMF22600920%' it is returning the 2 resultsets (execution time 0.03313019 seconds)
Issue:- When using two % in like in the above query i.e. REFERENCE like '%KMF22600920%' AND ROWNUM <= 20 ) , it is going to infinite.
Could you please let us know what is the issue with two % used in like and rownum
5) Modified version of Option1 query (move out the RNUM condition AND RNUM <= 20)
SELECT * FROM (
SELECT /*+ FIRST_ROWS(n) */ ROWNUM RNUM, A.* FROM LINE A
WHERE REFERENCE like '%KMF22600920%' ) WHERE RNUM > 0 AND RNUM <= 20
Execution Time:- 7.41368914 seconds
Returns 2 resultsets
Is the above query is best optimized query which should be used for the Pagination or still can improve on this ?

This would be easier to diagnose if there was an explain plan posted for the 'good' and 'bad' queries. Generally speaking using '%' on both sides precludes the use of any indexes.

Restricting number of rows in EJB QL using rowNum or rowId

Hii Javaites
I am using EJB finder methods to get a a list of records from database.
Now i want that only particular number of records should be fetched.
For tht i want 2 use rownum or rowId.
Can anyone plz tell me can we do tht in EJB QL.
I m using Weblogic 8

shouldn't use rownum or rowid to do such a thing.
%

Using ROWNUM in ODI

hey,
i want to use ROWNUM in my target table (DAYS) like:
Field 1(rownum) Field2
1 Monday
2 Tuesday
i create a field in my target table and in the mapping i use ROWNUM but it doesnt work.
Thanks for ur help
Mehdi

Hi,
I think you want to use a sequence generated number for the first column right?
In that case : from my understanding to what you have posted -
Step-1 : Create a Procedure and pass the code under 'Details' tab,before this check the right Technology
Step-2: Create a Scenario,select Native Sequence --> click the correct Schema and check Development --> the created procedure name shows up --> click OK
Step-3 : Go to Mapping, open Expression editor for that Particular Column, click the Project Sequences and you will find the created Sequence. drag and drop in the editor
Now run the interface, you will get the desired result. it will generate the sequence num for that particular column
Regards,
M

Can we use rownum in procedures?

Hi,
Can we use rownum in procedures"
Thanks and regards
Gowtham Sen.

here is some examples that might be of help.
SQL> set serveroutput on;
SQL> create or replace procedure get_employee(p_empno number) as
2    cursor c1(pEmpNo number) is
3     select e.rn, e.empno, e.ename
4       from (select rownum rn, empno, ename
5               from emp
6             order by empno) e
7      where e.empno = pEmpNo;
8 begin
9    for c1_rec in c1(p_empno) loop
10      dbms_output.put_line('The rownum is '||to_char(c1_rec.rn));
11      dbms_output.put_line('The employee name is '||c1_rec.ename);
12    end loop;
13 end;
14 /
Procedure created.
SQL> execute get_employee(7788);
The rownum is 8
The employee name is SCOTT
PL/SQL procedure successfully completed.
SQL> execute get_employee(7654);
The rownum is 5
The employee name is MARTIN
PL/SQL procedure successfully completed.
SQL>

Java.sql.SQLException: Invalid column index Query: while using ROWNUM

hi ,
i am getting the invalid column index query error while executing following query .i m able to run it properly without using rownum but when i append rownum i m getting error.i m using apache queryrunner for execution of query.
java.sql.SQLException: Invalid column index Query: select * from (
SELECT
TO_CHAR(A.REQ_FOR_RATING_ID) RFQID,
TO_CHAR(F.COV_PLAN_ID) COVPLANID,
B.FIRM_NAME FIRMNAME,
B.PRIMARY_ZIP_CD ZIP,
A.PRODUCR_CD PRODUCERCD,
A.PRODUCR_NAME PRODUCER,
H.COV_NAME COVDESP,
C.SALE_OFFC_CD SALEOFFCCD,
C.USR_OFFC_NAME USROFFC,
C.USR_NAME USR,
C.USR_REP_CD USRREPCD,
to_char((SELECT TO_CHAR(COUNT(EMP_NBR)) COUNT FROM ROSTR_DATA WHERE ROSTR_ID = F.ROSTR_ID)) AS count,
TO_CHAR(B.SIC_CD) SICCD,
F.INDSTRY_TYPE_IND INDTYPEIND,
TO_CHAR(F.MANL_SIC_FCTR_NBR) MANSICFACTOR,
TO_CHAR(F.UW_OVERD_SIC_FCTR_NBR) UWOVERDSICFACTOR,
TO_CHAR(G.AREA_FCTR_NBR) STRAREAFACTOR,
G.COV_ID COVID,
F.PLAN_APPRVL_STATUS_CD PLANAPPRVLCD,
F.PLAN_PROGRS_STATUS_CD PLANPROGRESSSTATUSCD ,
F.PLAN_SALE_ASSMNT_CD PLANSALEASSMTCD,
F.CREATD_DT CREATEDDT,
NVL(to_char(F.PLAN_RELSED_DT),' ') PLANRELSEDDT,
TO_CHAR(F.PLAN_RELSED_BY_ID) PLANRELSEDBYID,
TO_CHAR(F.PROPOSD_EFF_DT) PROPOSDEFFECTIVEDT,
TO_CHAR(A.GRACE_PERIOD_NBR) GRACEPERIOD,
A.RNWL_15_MONTH_IND FIFTEENMONTHRNWLIND ,
I.CO_DESC_TXT COMPANYNAME ,
NVL(to_char(F.PLAN_APPRVL_DT),' ') approvedDt,
               (Select U.USR_NAME from USR_DETL U WHERE U.USR_ID = F.PLAN_RELSED_BY_ID) as planRelsedByName,
(Select U.USR_NAME from USR_DETL U WHERE U.USR_ID = F.PLAN_APPRVR_ID) as approvedByName,
'' createdByName,
ROWNUM rnum
FROM
REQ_FOR_RATING A,
FIRM B,
USR_DETL C,
SALE_OFFICE D,
QUOTE_SCENRIO E,
QUOTE_COV G,
COV_PLAN F,
COV_LKUP H,
CO_LKUP I
WHERE
A.FIRM_ID = B.FIRM_ID AND
A.SALE_REP_ID = C.USR_ID AND
C.SALE_OFFC_CD = D.SALE_OFFC_CD AND
A.REQ_FOR_RATING_ID=E.REQ_FOR_RATING_ID AND
E.QUOTE_SCENRIO_ID=G.QUOTE_SCENRIO_ID AND
G.QUOTE_COV_ID=F.QUOTE_COV_ID AND
G.COV_ID=H.COV_ID AND
I.CO_CD = F.CO_CD AND
TO_CHAR(F.CREATD_DT,'YYYYMMDD') > TO_CHAR(TO_DATE('07/16/2007', 'MM/DD/YYYY HH24:MI:SS'),'YYYYMMDD') AND
TO_CHAR(F.CREATD_DT,'YYYYMMDD') < TO_CHAR(TO_DATE('10/16/2007', 'MM/DD/YYYY HH24:MI:SS'),'YYYYMMDD')
and rownum <=?) where rnum >=? Parameters: [07/15/2007 00:00:00, 10/15/2007 23:59:59, 1117, 1]

That's a SQL fault, not a JDBC/Java fault.

USING ROWNUM

Hi,
I have 4 tables ( 1 parent - 3 child). Reference is the primary key/FK in these tables. Two of the child tables have 1..1 mapping with the parent table and I have created a view called data_view that would have all the essential columns from the parent + 2 child tables.
One of the child table (WORKFLOW) holds a 1.. m relationship with the parent table.
Now I want to move data from the 4 tables to two history
tables . One history table has the structure just similar to the data_view and the other history table has the same set of columns as the workflow table.
I tried to code a logic where by I insert the first 1000 rows into the history tables and then delete the same from the base tables. I placed this in a loop and gave the exit criteria as SQL%NOTFOUND
After inserting the first 1000 rows into the history tables and deleting the same from the base tables, the loops exits during the second iteration with the error, primary key constraint in the history table violated.
Am I missing something. Your comments on this would be appreciated
FUNCTION MOV(p_date DATE)
RETURN NUMBER
AS
BEGIN
LOOP
INSERT INTO HIST (
column_names(SELECT
column_names
FROM
dATA_VIEW
WHERE
TE_DATE <= P_DATE
AND REFERENCE NOT IN (SELECT REFERENCE FROM WORKFLOW WHERE PROCESSING_TYPE IN ('K','E'))
AND ROWNUM < 1000 );
EXIT WHEN SQL%NOTFOUND;
INSERT INTO WORKFLOW_HIST
(column_names)
(SELECT
column_names
FROM WORKFLOW
WHERE REFERENCE IN (SELECT reference FROM DATA_VIEW WHERE TE_DATE <= P_DATE
AND REFERENCE NOT IN (SELECT REFERENCE FROM WORKFLOW WHERE PROCESSING_TYPE IN ('K','E'))
AND ROWNUM < 1000));
DELETE FROM BASE CASCADE
WHERE REFERENCE IN ( SELECT reference FROM DATA_VIEW
WHERE TE_DATE <= P_DATE
AND REFERENCE NOT IN (SELECT REFERENCE FROM WORKFLOW WHERE PROCESSING_TYPE IN ('K','E'))
AND ROWNUM < 1000);
COMMIT;
END LOOP;
RETURN 0;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(SQLERRM);
ROLLBACK;
RETURN SQLCODE;
END MOV;
thanks

Hi,
The problem is just beacuse of ROWNUM..
SELECT REFERENCE FROM WORKFLOW WHERE PROCESSING_TYPE IN ('K','E'))
AND ROWNUM < 1000 );
Instead try this statement...
SELECT REFERENCE FROM (Select Reference from WORKFLOW WHERE PROCESSING_TYPE IN ('K','E')
Order By Reference)
Where ROWNUM <= 1000;
Sol is if you use "order by" inside a subquery and then use ROWNUM, it should solve your problem.
My suggestion is plz dont rely on ROWNUM on these kind of operations. You can get unexpected results.
You can also use ROWNUMBER() instead of ROWNUM.
Thanks...

Problem using java String.split() method

Hi all, I have a problem regarding the usage of java regular expressions. I want to use the String.split() method to tokenize a string of text. Now the problem is that the delimiter which is to be used is determined only at runtime and it can itself be a string, and may contain the characters like *, ?, + etc. which are treated as regular expression constructs.
Is there a way to tell the regular expression that it should not treat certain characters as quantifiers but the whole string should be treated as a delimiter? I know one solution is to use the StringTokenizer class but it's a legacy class & its use is not recommended in Javadocs. So, does there exist a way to get the above functionality using regular expressions.
Please do respond if anyone has any idea. Thanx
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public class StringSplit {
public static void main(String args[]) throws Exception{
new StringSplit().doit();
public void doit() {
String s3 = "Dear <TitleNo> ABC Letter Details";
String[] temp = s3.split("<>");
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public void dump(String []s) {
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Want to extract only string between <>
for example to extract <TitleNo> only.
any suggestions please ?

Using '\n' to split lines

I've used '\n' to split lines of text but it doesn't work with all phones. Is there any other way to do it? I'm not using canvas.
append("Title"+'\n'+"something");Edited by: Sypress on Mar 13, 2010 11:12 PM

Use an array of length 2 to store the Strings or if they are related use a Map<String,String> or use Map.Entry if only a sing pair is required or create your own pair class, or ....
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Using ROWNUM to split a job in half?

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