A subquery in order by clause

I don't know what's the meaning of a subquery in order by clause.
for example
select * from table_name
order by (select column from table_name where rownum<=1),
I hope someone can tell me the answer

I don't think I can really come up with a situation where it would be any better than other approaches, but it can be used to derive a value which is then used to ORDER the results of the outer query, i.e.
SQL> SELECT a FROM t;
A
A1
B1
2 rows selected.
SQL> SELECT a, seq FROM o;
A SEQ
A1 10
B1 20
2 rows selected.
SQL> SELECT a FROM t
2 ORDER BY ( SELECT seq FROM o WHERE o.a = t.a );
A
A1
B1
2 rows selected.
But, I would still go with a simple join in this situation.
Note, that the subquery can only return one row :
SQL> SELECT * FROM T ORDER BY ( SELECT A FROM T );
SELECT * FROM T ORDER BY ( SELECT A FROM T )
ERROR at line 1:
ORA-01427: single-row subquery returns more than one row

Similar Messages

Order by clause in cursor problem

Hello,
I'm unable to compile package body when i'm using order by clause in cursor subquery in stored procedure.
Sample code:
CREATE PACKAGE Announces AS
TYPE tRefCur IS REF CURSOR;
PROCEDURE TopAnnounces(
iiCount IN NUMBER,
osAnnounces OUT tRefCur,
oiRetVal OUT NUMBER
END Announces;
CREATE PACKAGE BODY Announces AS
PROCEDURE TopAnnounces(
iiCount IN NUMBER,
osAnnounces OUT NUMBER,
oiRetVal OUT NUMBER
AS
BEGIN
OPEN osAnnounces FOR
SELECT Id, Name, AnnCount FROM
SELECT Id, Name, COUNT(CategoryId) AS AnnCount FROM tblAnnounces
GROUP BY Id, Name
-- bellow is the line, where the code crash
ORDER BY AnnCount DESC
WHERE ROWNUM < iiCount + 1;
oiRetVal := 0;
EXCEPTION
WHEN OTHERS THEN
oiRetVal := -255;
END TopAnnounces;
END Announces;
If I compile the code above I will get this error:
PLS-00103: Encoutered the symbol "ORDER" when expecting on of the following:
After I remark the problematic line, the compilation is successful (but not the result :).
Is there something I'm doing wrong?
Thanks for advice
Vojtech Novacek
null

Sorry you can not use order by clause into one temporal table created by subquery.
Put the order by clause offside of subquery.
Atte.
CC.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Vojtech Novacek:
Hello,
I'm unable to compile package body when i'm using order by clause in cursor subquery in stored procedure.
Sample code:
CREATE PACKAGE Announces AS
TYPE tRefCur IS REF CURSOR;
PROCEDURE TopAnnounces(
iiCount IN NUMBER,
osAnnounces OUT tRefCur,
oiRetVal OUT NUMBER
END Announces;
CREATE PACKAGE BODY Announces AS
PROCEDURE TopAnnounces(
iiCount IN NUMBER,
osAnnounces OUT NUMBER,
oiRetVal OUT NUMBER
AS
BEGIN
OPEN osAnnounces FOR
SELECT Id, Name, AnnCount FROM
SELECT Id, Name, COUNT(CategoryId) AS AnnCount FROM tblAnnounces
GROUP BY Id, Name
-- bellow is the line, where the code crash
ORDER BY AnnCount DESC
WHERE ROWNUM < iiCount + 1;
oiRetVal := 0;
EXCEPTION
WHEN OTHERS THEN
oiRetVal := -255;
END TopAnnounces;
END Announces;
If I compile the code above I will get this error:
PLS-00103: Encoutered the symbol "ORDER" when expecting on of the following:
After I remark the problematic line, the compilation is successful (but not the result :).
Is there something I'm doing wrong?
Thanks for advice
Vojtech Novacek<HR></BLOCKQUOTE>
null

Order by clause in Sub query

Hi,
Can we use order by clause in Sub query?
While using the order by clause, I am getting the "missing expression error" . If I remove order by clause query executing fine.
Here is my query:
select *
from emp_mstr
where emp_no in(select
emp_no
from emp_mstr
order by branch_no);
Thanks & Regards,
Mahi

May be you miss some required spaces also, other than wrong use of ORDER BY
select *
from emp_mstr
where emp_no in
     ( select e2.emp_no
       from emp_mstr e2
--       order by e2.branch_no
     );Why do you want to ORDER BY in the subquery, which you use with IN clause? That will not make any difference in the result..Means the result you get with ORDER BY will be same as without that.. And in this case, ORDER by is a unncessary overhead.. And Ordering is very costly..
And why do you want to have the IN clause at all in your query? You are referring the same tables in the main query and sub query..
The below will give the same result
select *
from emp_mstr
where emp_no is not nullIf you want to use another table in the subquery, always use aliasess...
select *
from emp_mstr
where emp_no in
     ( select e2.emp_no
       from emp_mstr2 e2
--       order by e2.branch_no
     );

Order By Clause in View

Hi,
I have a doubt regarding Order By Clause in Views.
As per my knowledge, we can't put an order by clause in the subquery that defines view. But when i created a view in Oracle 9i with the order by clause, view got created.
Please see the my view code below :
create or replace view testview
as select * from employees
order by 1,2;
Could anyone please confirm that we can have order by clause in Views in oracle 9i?
Thanks,
Tandra

According to the SQL Reference doc, there is no such restriction for a non-updatable view:
The view subquery cannot select the CURRVAL or NEXTVAL pseudocolumns.
If the view subquery selects the ROWID, ROWNUM, or LEVEL pseudocolumns, those columns must have aliases in the view subquery.
If the view subquery uses an asterisk (*) to select all columns of a table, and you later add new columns to the table, the view will not contain those columns until you re-create the view by issuing a CREATE OR REPLACE VIEW statement.
For object views, the number of elements in the view subquery select list must be the same as the number of top-level attributes for the object type. The datatype of each of the selecting elements must be the same as the corresponding top-level attribute.
You cannot specify the SAMPLE clause.
This restriction exists only for updatable views:
If you want the view to be inherently updatable, it must not contain any of the following constructs:
A set operator
A DISTINCT operator
An aggregate or analytic function
A GROUP BY, ORDER BY, CONNECT BY, or START WITH clause
A collection expression in a SELECT list
A subquery in a SELECT list
Joins (with some exceptions as described in the paragraphs that follow).

Read only view which has an ORDER BY clause

Aim to create a read only view which has an ORDER BY clause
Sample script
CREATE TABLE tab1 (
col1 VARCHAR2(3),
col2 NUMBER
INSERT INTO tab1(col1, col2) VALUES ('ccc', 30);
INSERT INTO tab1(col1, col2) VALUES ('bbb', 20);
INSERT INTO tab1(col1, col2) VALUES ('ddd', 40);
INSERT INTO tab1(col1, col2) VALUES ('aaa', 10);
COMMIT;
-- To creat View
CREATE OR REPLACE VIEW v_tab1
AS
SELECT
col1,
col2
FROM
tab1
ORDER BY
col1
WITH READ ONLY;
I get the following error
WITH READ ONLY
ERROR at line 10:
ORA-00933: SQL command not properly ended
When I comment out the ORDER BY clause, the view is created
Pls let me know how I can create a read only view with ORDER BY clause

Hi,
take a look at the documentation for CREATE VIEW, there is a restriction:
"You cannot specify the ORDER BY clause in the subquery if you also specify the subquery_restriction_clause."
Wolfgang

Subquery in the Where clause

Can I put a subquery in the where clause, on the left side on the operator?
This is a multi-row query.
Like this,
   select a.col1, a.col2, b.col1, b.col2,
             my_function(a.date1, b.date2) AS GROSSDAYS
   from table1 a
   where ( select ( a.date1 - b.date2 ) as range
               from     table1 a
               join      table2 b
               on       a.col3 = b.col3
               where rownum =1
               in ( 1,2,3)
and a.col1 = b.col2I need to use a subquery because the column I need does not exist in the table, and I cannot make any changed to the table structure.
Is what I'm doing possible?
The subquery is the same as the function I have in the Select clause.

I tried a subquery in the where clause, but now I'm getting a missing expression error!
   SELECT
        r.complete_flag, r.order_num, r.referral_num, TRUNC(r.referral_datetime) AS referral_datetime,
        r.clinic_specialty, a.appointment_datetime, TRUNC(a.appointment_date_made) AS appt_datemade, a.appointment_status_id,
         scref.scr_rules.calcatcdays(r.referral_datetime,a.appointment_date_made) AS ATCDays -- returns difference between two dates
FROM
        referral r,
                             ( SELECT referral_num,appointment_datetime, appointment_date_made, appointment_status_id
                                  FROM   ( SELECT referral_num, appointment_datetime, appointment_date_made, appointment_status_id,
                                            ROW_NUMBER() OVER (PARTITION BY referral_num
                                            ORDER BY appointment_datetime) rn
                                        FROM   appointment
                                 WHERE rn = 1
                         a
WHERE r.order_num IS NOT NULL
AND   ( SELECT adays                      -- THIS IS WHERE I'M GETTING A MISSING EXPRESSION ERROR!!!
       FROM ( SELECT scref.scr_rules.calcatcdays(r.referral_datetime,a.appointment_date_made) AS adays
                FROM referral r
                 JOIN appointment a
                 ON   a.referral_num = r.referral_num
                 WHERE ROWNUM = 1
       WHERE adays
      ) = 3
AND   r.referral_num = a.referral_num(+)
AND   TRUNC(r.referral_datetime) >= TO_DATE('01-JUL-05','DD-MON-YY')
AND   TRUNC(r.referral_datetime) <= TO_DATE('31-JUL-05','DD-MON-YY')

Correlated Subquery in ORDER BY

The following is a valid sql. But, what is meant by a correlated scalar subquery in the ORDER BY clause?
SELECT employee_id, last_name
FROM employees e
ORDER BY (SELECT department_name
FROM departments d
WHERE e.department_id=d.department_id);

It is exactly the same in the ORDER BY clause as in any other part of a query. As biswabijay says, the correlated query is run once for each row in the result set.
In essence, the fileds selected from the correlated query are added to the result for each row, then evaluated in the appropriate context (e.g. compared in a WHERE clause, used for sorting in an ORDER BY).
A small addition to your original query makes this more apparent.
SQL> SELECT employee_id, last_name, department_name
2 FROM employees e, departments d
3 WHERE e.department_id=d.department_id
4 ORDER BY (SELECT department_name
5 FROM departments d
6 WHERE e.department_id=d.department_id);
EMPLOYEE_ID LAST_NAME                 DEPARTMENT_NAME
        205 Higgins                   Accounting
        206 Gietz                     Accounting
        200 Whalen                    Administration
        100 King                      Executive
        101 Kochhar                   Executive
        102 De Haan                   Executive
        185 Bull                      Shipping
        144 Vargas                    Shipping
        143 Matos                     Shipping
        184 Sarchand                  ShippingHTH
John

RESTICTIONS ON ORDER BY CLAUSE

Can someone clear my doubts.I find it in DOCS but didn't succeded.Where it is written ?Please Explain me.
Can We use ORDER BY CLAUSE in SubQuery ?
Thanks.
KarTiK.

No,
Even though It wont work..
Findout yourself..
SQL> select ename,sal
2 from (select a.*,rownum s
3        from emp a
4        order by sal desc)
5 where s = &rnk
6 /
Enter value for rnk: 4
old   5: where s = &rnk
new   5: where s = 4
ENAME             SAL
JONES            2975
SQL> /
Enter value for rnk: 3
old   5: where s = &rnk
new   5: where s = 3
ENAME             SAL
WARD             1250
SQL> /
Enter value for rnk: 1
old   5: where s = &rnk
new   5: where s = 1
ENAME             SAL
SMITH             800

Subquery in GROUP BY CLAUSE

Is it possible to place a subquery in the GROUP BY CLAUSE? If it is, can anyone show me an example? thanks

Hi,
Here's a GROUP BY clause that uses an IN-subquery:
SELECT    COUNT (*)     AS cnt
FROM       scott.emp
GROUP BY CASE
          WHEN deptno IN (
                         SELECT     deptno
                         FROM     scott.dept
                         WHERE     loc     = 'NEW YORK'
          THEN 1
          ELSE 2
       END
;I've never seen a need for this (and I've been to a state fair, a rodeo and a picnic!)
Interestingly, if I copy the expression from the GROUP BY clause to the SELECT clause:
SELECT    COUNT (*)     AS cnt
,       CASE
          WHEN deptno IN (
                         SELECT     deptno
                         FROM     scott.dept
                         WHERE     loc     = 'NEW YORK'
          THEN 1
          ELSE 2
       END          AS new_york
FROM       scott.emp
GROUP BY CASE
          WHEN deptno IN (
                         SELECT     deptno
                         FROM     scott.dept
                         WHERE     loc     = 'NEW YORK'
          THEN 1
          ELSE 2
       END
;I get this error:
...             WHEN deptno IN (
ERROR at line 3:
ORA-00979: not a GROUP BY expressionDespite what that book says, you can use an IN-subquery like this in an ORDER BY clause:
SELECT       deptno
FROM       scott.emp
ORDER BY CASE
          WHEN deptno IN (
                         SELECT     deptno
                         FROM     scott.dept
                         WHERE     loc     = 'DALLAS'
          THEN 1
          ELSE 2
       END
;(New York is department 10, the first department anyway, so it's not as clear to use the exact same example.)

Subquery with ORDER BY

AFAIK, subquery can have ORDER BY clause in 9iR2. But why I got this error:
SQL> SELECT student_id FROM student
2 WHERE zip =any (SELECT zip
3 FROM zipcode
4 WHERE rownum<=5 ORDER BY zip)
5
SQL> /
WHERE rownum<=5 ORDER BY zip)
ERROR at line 4:
ORA-00907: missing right parenthesis
The error disappear if I remove the ORDER BY clause. My version is 9.2.0.1.0.

I'm sorry. ORDER BY is valid only in inline view and not in sub-query.
SQL>select empno from emp
2   where empno in (select empno from emp order by sal)
3 /
where empno in (select empno from emp order by sal)
ERROR at line 2:
ORA-00907: missing right parenthesis
SQL>select empno from (select empno from emp order by sal)
2 /
    EMPNO
     7369
     7900
     7876
     7654
     7521
     7934
     7844
     7499
     7782
     7698
     7566
     7902
     7788
     7839
     8888
     9999
16 rows selected.
SQL>Cheers
Sarma.

Order by clause not working

Hi, everyone,
I am trying to use the following insert statement to insert records in asc order. if i use the select statement alone the order by clause works fine, but when i use the same sql and add a insert into table statment the order by clause does not work. I am not getting the records in ascending order. could anybody help me in this regard?
INSERT INTO cat_sales_stg
select      b.SSC,
     ltrim(rtrim(a.CAT_DESC)) cat_desc,
     SUM(a.AMOUNT) AMOUNT
FROM Trans a, SSC b
WHERE a.ACCOUNT_NUMBER = TO_CHAR(b.ACCOUNT_NUMBER)
     AND a.TMONTH >= 200905 AND a.TMONTH <= 200910
     AND a.FORMAT_NAME = 'ABC'
     AND b.BMONTH = 200910
     AND b.SAMPLE = 3
     AND b.BANNER_NAME = 'ABC'
     AND b.MODEL_NAME = 'XYZ'
group by b.SSC, ltrim(rtrim(a.CAT_DESC))
order by ssc,cat_desc
Thanks in advance

user10636796 wrote:
Hi, everyone,
I am trying to use the following insert statement to insert records in asc orderWhat Toon, William, and others have said is that you DON'T insert rows in a specific order. That is completely outside the way relational databases are designed. You insert rows as unordered and use an ORDER BY clause in a SELECT when reading them. ORDER BY is for SELECT statements, not INSERT.
In particular Toon poined out that we can't control where individual rows get stored.
There is a databas object called a varray that can store data in sorted order. I have never seen them used because selecting the data back out again is more work; using an ordinary table and an ORDER BY clause is much easier.

Suppress "Order By" clause in Answers Query

Hello,
Is it possible to Suppress "Order By" clause in Answers Query.
I'm using a database view as data source. In the view definition, "order by" clause is already specified. Is it possible to get the same order in the OBIEE report??
I do not want to use Sort Order column in the repository.
Thanks,
Girish

You add a rownumber to your DB view and use that to 'sort' your report.
regards
John
http://obiee101.blogspot.com/

How to make an ORDER BY clause dynamic

is there anyway to make the ORDER BY clause in an SQL query within a DB control
dynamic? I have tried to pass a String of the column name and place it in the
statement within {}, but it doesn't work

"Mark" <[email protected]> wrote:
>
is there anyway to make the ORDER BY clause in an SQL query within a
DB control
dynamic? I have tried to pass a String of the column name and place
it in the
statement within {}, but it doesn't workDid you find how ? please let me know, I also need to have a dynamic order by
clause.

In Report,order by clause is not working

Hi All,
For the report i prepared the query in this one am using the order by clause,i run the query in the sql plus working fine am getting the data based on the order by clause.when i use the same query for the report am getting the data but not in the order(i.e order by clause in not working).
Please help me how to do this one.
Thanks in Advance.
Regards,
Leelakrishna.G

Hi Dora,
Data is coming in the proper sequence,but in the first group data is not coming(In first group data first line only displaying,remaining data is not comming).
My req is:
The report is executing based on the creation date(i.e.,from creation date to today).
In this so many Purchase requisitions will be there for this one different approval in different times will be there.
For Ex:
we will take 2 PR number only(for the first one 3 approvals,second one 4 levels of approval).
1. one supplier 1person raised by 1PR submit
No Action
Approve
2. 2Supplier 2personraised by 2PR Submit
NO Action
Forword
Approve
with ur suggestion am trying data is gettin fine but first group first line is coming remaining data is not coing.
EX:
1. one supplier 1person raised by 1PR submit
No Action
Approve
2PR Submit
NO Action
Forword
Approve
Note:"2. 2Supplier 2personraised by " this kind of lines data is missing.
Can you pls check and suggest me how i can do this.
Thanks in Advance.
Regards,
Leelakrishna.G

Error : The ORDER BY clause is invalid in views, inline functions, derived

Hi All,
I am on 11g 6.2, Windows Server 2008, my db SQL server 2008, I am facing the error for the reports in which I am trying to edit one the column formula and do something like 'abc/sum(abc)*100'.
10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 43113] Message returned from OBIS. [nQSError: 43119] Query Failed: [nQSError: 16001] ODBC error state: 37000 code: 8180 message: [Microsoft][ODBC SQL Server Driver][SQL Server]Statement(s) could not be prepared.. [nQSError: 16001] ODBC error state: 37000 code: 1033 message: [Microsoft][ODBC SQL Server Driver][SQL Server]The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP or FOR XML is also specified.. [nQSError: 16002] Cannot obtain number of columns for the query result. (HY000)
One of the solutions to this which I have found is to edit the EXPRESSION_IN_ORDERBY_SUPPORTED feature in the db properties.
I want to know what does EXPRESSION_IN_ORDERBY_SUPPORTED means?
When I create a calculations in 11g like abc/sum(abc) in the column formula for a column then i get this error.
What does this error mean? Does OBIEE 11g doesn't support using these expressions in the report and the fact that it applies the order by clause to the reports, the report fail?
Could anybody please explain the issue. There is very limited information on this over the web.
Thanks in advance.
Ronny

Thanks svee for the quick response, actually i had resolved the issue by unchecking the EXPRESSION_IN_ORDERBY_SUPPORTED option in the database. I want to understand how does that makes the difference?
What does EXPRESSION_IN_ORDERBY_SUPPORTED mean? Does it mean that if I give any expression in my answers report and since obiee uses a order by for all the queries, the expression won't be supported?
Please explain.

A subquery in order by clause

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