Subquery in the Select Clause

Can a subquery in the select clause return more than one field?
Something like this:
select ename,
(select dname, loc from dept where e.deptno = deptno) as (dname,loc)
from emp e

A simple way to find out is to test it. In my tests below, the original query produces an error that says it didn't find FROM where it expected. Eliminating "as (dname,loc)" produces an error about too many values. Putting only one value in the subquery in the select clause works, whether it is dname or loc. Concatenating the two columns as dname || ' ' || loc to produce one value in the subquery in the select clause works. Using two separate subqueries, one for dname and one for loc works. And, lastly, a cursor statement with both values works, although the output is a little hard to read. This may be different in newer versions. I am using Oracle 8.1.7. It may be different in 9i. I was unable to locate any documentation on the cursor statement or cursor operator which I have also heard it called. I only knew to try it because I have seen it used. I looked up the SELECT syntax in the 9i SQL Reference and there was no mention of cursor in the select clause. Can anyone provide a link to some documentation on this? I vaguely recall reading something that said that, other than outputting from SQL*Plus as below, it wasn't yet compatible with anything else, like you can't use it in PL/SQL, but I can't remember where I read it.
SQL> -- 2 values in subquery in select clause:
SQL> select ename,
2 (select dname, loc from dept where e.deptno = deptno) as (dname,loc)
3 from emp e
4 /
(select dname, loc from dept where e.deptno = deptno) as (dname,loc)
ERROR at line 2:
ORA-00923: FROM keyword not found where expected
SQL> select ename,
2 (select dname, loc from dept where e.deptno = deptno)
3 from emp e
4 /
(select dname, loc from dept where e.deptno = deptno)
ERROR at line 2:
ORA-00913: too many values
SQL> -- 1 value in subquery in select clause:
SQL> select ename,
2 (select dname from dept where e.deptno = deptno)
3 from emp e
4 /
ENAME      (SELECTDNAMEFR
SMITH      RESEARCH
ALLEN      SALES
WARD       SALES
JONES      RESEARCH
MARTIN     SALES
BLAKE      SALES
CLARK      ACCOUNTING
SCOTT      RESEARCH
KING       ACCOUNTING
TURNER     SALES
ADAMS      RESEARCH
JAMES      SALES
FORD       RESEARCH
MILLER     ACCOUNTING
14 rows selected.
SQL> select ename,
2 (select loc from dept where e.deptno = deptno)
3 from emp e
4 /
ENAME      (SELECTLOCFRO
SMITH      DALLAS
ALLEN      CHICAGO
WARD       CHICAGO
JONES      DALLAS
MARTIN     CHICAGO
BLAKE      CHICAGO
CLARK      NEW YORK
SCOTT      DALLAS
KING       NEW YORK
TURNER     CHICAGO
ADAMS      DALLAS
JAMES      CHICAGO
FORD       DALLAS
MILLER     NEW YORK
14 rows selected.
SQL> select ename,
2 (select dname || ' ' || loc from dept where e.deptno = deptno)
3 from emp e
4 /
ENAME      (SELECTDNAME||''||LOCFROMDEP
SMITH      RESEARCH DALLAS
ALLEN      SALES CHICAGO
WARD       SALES CHICAGO
JONES      RESEARCH DALLAS
MARTIN     SALES CHICAGO
BLAKE      SALES CHICAGO
CLARK      ACCOUNTING NEW YORK
SCOTT      RESEARCH DALLAS
KING       ACCOUNTING NEW YORK
TURNER     SALES CHICAGO
ADAMS      RESEARCH DALLAS
JAMES      SALES CHICAGO
FORD       RESEARCH DALLAS
MILLER     ACCOUNTING NEW YORK
14 rows selected.
SQL> select ename,
2 (select dname from dept where e.deptno = deptno),
3 (select loc from dept where e.deptno = deptno)
4 from emp e
5 /
ENAME      (SELECTDNAMEFR (SELECTLOCFRO
SMITH      RESEARCH       DALLAS
ALLEN      SALES          CHICAGO
WARD       SALES          CHICAGO
JONES      RESEARCH       DALLAS
MARTIN     SALES          CHICAGO
BLAKE      SALES          CHICAGO
CLARK      ACCOUNTING     NEW YORK
SCOTT      RESEARCH       DALLAS
KING       ACCOUNTING     NEW YORK
TURNER     SALES          CHICAGO
ADAMS      RESEARCH       DALLAS
JAMES      SALES          CHICAGO
FORD       RESEARCH       DALLAS
MILLER     ACCOUNTING     NEW YORK
14 rows selected.
SQL> -- cursor statement:
SQL> select ename,
2 cursor (select dname, loc from dept where e.deptno = deptno)
3 from emp e
4 /
ENAME      CURSOR(SELECTDNAME,L
SMITH      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
RESEARCH       DALLAS
1 row selected.
ALLEN      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
WARD       CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
JONES      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
RESEARCH       DALLAS
1 row selected.
MARTIN     CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
BLAKE      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
CLARK      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
ACCOUNTING     NEW YORK
1 row selected.
SCOTT      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
RESEARCH       DALLAS
1 row selected.
KING       CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
ACCOUNTING     NEW YORK
1 row selected.
TURNER     CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
ADAMS      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
RESEARCH       DALLAS
1 row selected.
JAMES      CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
SALES          CHICAGO
1 row selected.
FORD       CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
RESEARCH       DALLAS
1 row selected.
MILLER     CURSOR STATEMENT : 2
CURSOR STATEMENT : 2
DNAME          LOC
ACCOUNTING     NEW YORK
1 row selected.
14 rows selected.

Similar Messages

Subquery in the Where clause

Can I put a subquery in the where clause, on the left side on the operator?
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Like this,
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               join      table2 b
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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!
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Subquery in the From Clause

I have a query the contains a subquery in the from clause. The problem is how to join one of the tables in the subquery to one of the main tables. If I hard a value, the query runs, but using a table.column produced an "invalid column name" error.
Examples of both are below.
This one works
SELECT a.pay_rate, a.bill_rate, a.frequency, c.value
FROM SYSADM.ps_pb_wkord_sq_rte a, SYSADM.ps_md_erncd_action b,
SELECT DISTINCT z.value
FROM SYSADM.ps_md_erncd_action z
WHERE z.md_action = 'CALC_BURD' AND
z.system_id = 'PB' AND
z.erncd = 'REG' AND **This is the line in question**
z.effdt = (
SELECT MAX(z_ed.effdt)
FROM SYSADM.ps_md_erncd_action z_ed
WHERE z.setid = z_ed.setid AND
z.erncd = z_ed.erncd AND
z.effdt = z_ed.effdt AND
z.system_id = z_ed.system_id AND
z.md_action = z_ed.md_action AND
z_ed.effdt <= TO_DATE('04/01/2001','MM/DD/YYYY'))) c
WHERE a.erncd = b.erncd AND
b.effdt = (
SELECT MAX(b_ed.effdt)
FROM SYSADM.ps_md_erncd_action b_ed
WHERE b.setid = b_ed.setid AND
b.erncd = b_ed.erncd AND
b.effdt = b_ed.effdt AND
b.system_id = b_ed.system_id AND
b.md_action = b_ed.md_action AND
b_ed.effdt <= TO_DATE('04/01/2001','MM/DD/YYYY')) AND
a.group_id = 'PSD01' AND
a.workorder_no = 'H00034758' AND
a.assignment_no = 'H00034758-001' AND
b.system_id = 'PB' AND
b.md_action = 'EARN_TYPE' AND
b.value = 'R';
This one produces the error
SELECT a.pay_rate, a.bill_rate, a.frequency, c.value
FROM SYSADM.ps_pb_wkord_sq_rte a, SYSADM.ps_md_erncd_action b,
SELECT DISTINCT z.value
FROM SYSADM.ps_md_erncd_action z
WHERE z.md_action = 'CALC_BURD' AND
z.system_id = 'PB' AND
z.erncd = a.erncd AND **This is line in question**
z.effdt = (
SELECT MAX(z_ed.effdt)
FROM SYSADM.ps_md_erncd_action z_ed
WHERE z.setid = z_ed.setid AND
z.erncd = z_ed.erncd AND
z.effdt = z_ed.effdt AND
z.system_id = z_ed.system_id AND
z.md_action = z_ed.md_action AND
z_ed.effdt <= TO_DATE('04/01/2001','MM/DD/YYYY'))) c
WHERE a.erncd = b.erncd AND
b.effdt = (
SELECT MAX(b_ed.effdt)
FROM SYSADM.ps_md_erncd_action b_ed
WHERE b.setid = b_ed.setid AND
b.erncd = b_ed.erncd AND
b.effdt = b_ed.effdt AND
b.system_id = b_ed.system_id AND
b.md_action = b_ed.md_action AND
b_ed.effdt <= TO_DATE('04/01/2001','MM/DD/YYYY')) AND
a.group_id = 'PSD01' AND
a.workorder_no = 'H00034758' AND
a.assignment_no = 'H00034758-001' AND
b.system_id = 'PB' AND
b.md_action = 'EARN_TYPE' AND
b.value = 'R';
Any help is greatly appreciated.
Thanks,
JD Lippard

Hi JD,
your code is very difficult to read to i will give you some general information.
SELECT t1.c1,t1.c2
FROM table t1
, (SELECT t2.col1 alias1
, t2.col2 alias2
, a.s.o.
FROM anytable t2
) tablealias
WHERE t1.c1 = tablealias.alias1
You can select any columns inside this 'dynamic view' whichever you need for a join. Independent if you print them or not.
But you cannot join INSIDE this dynamic view to outer tables like
SELECT t1.c1,t1.c2
FROM table t1
, (SELECT t2.col1 alias1
, t2.col2 alias2
, a.s.o.
FROM anytable t2
WHERE t1.c2 = t2.col2
) tablealias
WHERE bla
Maybe it helps a bit.
Cheers,
Udo

Merge can't accept a variable in the select clause?

oracle 10.2
I have a stored procedure.
I have a variable, vseq, which I set a sequence variable. With all other sql statements I can do
insert into table a
select vseq
from dual;
Apparently a merge can't handle variables in the select clause. I get an error. I can get it to work when I hard code a value.
this is ridiculous...

merge can't handle variables in the select clauseCare to prove?
sql> DECLARE
2 v_first_name varchar2(20) := 'BOSS';
3 BEGIN
4 MERGE INTO sun_employees se
5 USING (SELECT * FROM employees WHERE department_id = 20) e
6 ON (e.employee_id = se.employee_id)
7 WHEN MATCHED THEN
8 UPDATE SET salary = e.salary
9 WHEN NOT MATCHED THEN
10 INSERT(employee_id, first_name, last_name, department_id)
11 VALUES (e.employee_id, v_first_name, e.last_name, e.department_id);
12 END;
13 /
PL/SQL procedure successfully completed.
sql> select first_name from sun_employees;
FIRST_NAME
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Using @Prompt in the SELECT clause (?)

Post Author: faltinowski
CA Forum: Semantic Layer and Data Connectivity
Product: Business Objects
Version: 6.5 SP3
Patches Applied: MHF11 and CHF48
Operating System(s): Windows
Database(s): Oracle
Error Messages: "Parse failed: Exception: DBD, ORA-00903 invalid table name State N/A"
Hi! I'm bewildered -- we have an object that parses but when I try to reproduce this object, it does not.
We have a universe that's been in production for several years using an object developed by another designer who's no longer with the company. This object is a dimension, datatype is character, and there's no LOV associated. The SELECT statement in this object is
decode(@Prompt('Select Snapshot Month','A','Object Definitions\CY Month Snapshot',MONO,CONSTRAINED),'00-Previous Month',to_number(to_char(add_months(sysdate,-1),'MM')),'01-Current Month',to_number(to_char(add_months(sysdate,0),'MM')),'01-January','1','02-February','2','03-March','3','04-April','4','05-May','5','06-June','6','07-July','7','08-August','8','09-September','9','10-October','10','11-November','11','12-December','12')
This object parses. The client uses the object in the select clause to capture the "month of interest" for the report. So the report may be for the entire year's data which is graphed to show trends, but there's a table below the graph which is filtered to show just the month of interest. Typically they use the value "00-Previous Month" so they can schedule the report and it will always show the last month's data.
Problem
The original object parses.
If I copy the object within the same universe, it parses.
If I copy the code into a new object in the same universe, it doesn't parse
If I copy the code into a new object in a different universe, it doesn't parse
If I copy the object to a different universe, then edit the LOV reference, it doesn't parse
If I create any new object having @Prompt in the SELECT statement, it doesn't parse.
If another designer tries - they get the same thing.
What am I missing? Obviously someone was able to create this successfully.
On the brighter side
The object I created in a new universe (which doesn't parse in the universe) seems to work fine in the report.

Seems that, the prompt syntax is correct.
But the condition is not correct.
You are taking the prompt value and not doing anything. That could be one issue for this error.
I believe that, you just want to capture the prompt value use it in report level and do not want to apply as a filter.
So, use the condition as follows.
@Prompt('Select Grouping','A',{'A','B','C'},mono,constrained) = @Prompt('Select Grouping','A',{'A','B','C'},mono,constrained)
Hope this helps!

Problems with query with more than 20 values in the select clause

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Hello Raju,
I will email you the connection settings when I return to the office.
One thing I should have mentioned: The sql string is returned from a package in the db, so the query region text I originally posted isn't quite correct.
it is something like:
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In a SQL statement, the SELECT clause is used to

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Is used to select rows of specified column...
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Hello all,
i'm getting error when i try to write sub query in having clause. check out my query
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from Sales2011.Sales2011_JT
INNER JOIN Sales2011.Sales2011_DG1 On Sales2011.Sales2011_DG1.DG1_ID =Sales2011.Sales2011_JT.DG1_ID
LEFT JOIN Sales2011.Sales2011_DIVDPTA On nvl(Sales2011.Sales2011_DIVDPTA.DIVDPTA_ITEM_DIVISION,' ')=nvl(Sales2011.Sales2011_DG1.Item_Division,' ')
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from Sales2011.Sales2011_JT
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LEFT JOIN Sales2011.Sales2011_DIVDPTA On nvl(Sales2011.Sales2011_DIVDPTA.DIVDPTA_ITEM_DIVISION,' ')=nvl(Sales2011.Sales2011_DG1.Item_Division,' ')
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having ( ROUND( Count( Sales2011.Sales2011_DG1.Item_Season ),0)
in ( select   ROUND( Count(
Sales2011.Sales2011_DG1.Item_Season ),0) from    Sales2011.Sales2011_DG1 )
Error at Command Line:1 Column:0
Error report:
SQL Error: ORA-00979: not a GROUP BY expression
00979. 00000 - "not a GROUP BY expression"
*Cause:
*Action:any help ???

Sorry unintentionally i have posted my question here.
will you please elaborate this? Becoz i'm not using group by clause in both query. First query run successfully but as i put sub query in having clause it raised an error. will you tell where i'm committing mistake?
Aggregates in the HAVING clause do not need to appear in the SELECT list. If the HAVING clause contains a subquery, the subquery can refer to the outer query block if and only if it refers to a grouping column.Edited by: Oracle Studnet on Aug 14, 2011 11:28 PM

Calling a function in the select clause.

I am using Oracle 11g.
I am trying to write a query like this
select name,age, sal, avg = avg_salary(age)
from customer
where sal >= avg;
However, I am not able to do so. What the query is trying to do is print the name, age and salary of every customer as well as the average salary for the customer's age where the customer's salary is greater than the average salary for his age.
Please help. Thanks.

Hi,
The way to assign a column alias is to put the alais after the expression. It makes your code clearer if you put the keyword AS after the expression and before the alias, but this is not required.
SELECT     name
,     age
,     sal
,     avg_salary (age)     AS avg_salary_age
FROM     customer
WHERE     sal     >= avg_salary (age)
;You can't reference a column alais in the same query where it is defined (except in an ORDER BY clause). If you want to reference the alias anywhere else (e.g., in the WHERE clause) you have to define it in a sub-query; then you can use it anywhere you want in the super-query, liek this:
WITH     got_avg_salary_age     AS
     SELECT     name
     ,     age
     ,     sal
     ,     avg_salary (age)     AS avg_salary_age
     FROM     customer
SELECT     *
FROM     got_avg_salary_age
WHERE     sal     >= avg_salary_age
;Since AVG is the name of a built-in function, there could be problems using it as a column alias. You could call it average, if you don't like avg_salary_age.

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Hi All,
I am given a code which has very complicated SELECT clause which I am not able to break in understandable form.
Its like this:
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Are you sure that the parenthesis that stands immediatly before "stat" is well placed?
You're adding the where clause only if selecting through database link, seems strange...
Maybe it should be
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[My Italian Oracle blog|http://oracleitalia.wordpress.com/2009/12/29/estrarre-i-dati-in-formato-xml-da-sql/]

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pascal

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Hello,
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user13080027 wrote:
Hi
I mean I receive the error ORA-00904-"t1.column3" invalid identifier.Something does not add up here. You said earlier
I cannot join table3 with table1 in the outermost query, because the structure of this database is such that it would not work for me.Why can't you rewrite your query something like follows:
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Hi,
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Thanks much for your quick response.
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*Declarations
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DATA: new_line TYPE REF TO data.
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FIELD-SYMBOLS: <fs_2> TYPE ANY,
                 <l_field> TYPE ANY.
Get the fields of the database table, here i am passing the table name
CALL FUNCTION 'DD_NAMETAB_TO_DDFIELDS'
    EXPORTING
KEYFIELDS       = 'X'
NULLABLE        = 'X'
        tabname        = lv_tab_name
    TABLES
        ddfields        = ddfields.
LOOP AT ddfields INTO ls_ddfields.
    ls-fieldname = ls_ddfields-fieldname.
    APPEND ls TO lt.
ENDLOOP.
*Assigning Field-Symbol to our dynamic internal table
ASSIGN lt_data TO <fs_data>.
Calling the method CREATE_DYNAMIC_TABLE
CALL METHOD cl_alv_table_create=>create_dynamic_table
    EXPORTING
      it_fieldcatalog           = lt
    IMPORTING
      ep_table                  = <fs_data>
    EXCEPTIONS
      generate_subpool_dir_full = 1
      OTHERS                    = 2.
IF sy-subrc EQ 0.
    ASSIGN <fs_data>->* TO <fs_1>.
Create a work area for the dynamic table.
    CREATE DATA new_line LIKE LINE OF <fs_1>.
A field-symbol to access that work area
    ASSIGN new_line->* TO <fs_2>.
ENDIF.
Selecting the Data from the respective table.
SELECT *
         FROM (lv_tab_name)
         INTO CORRESPONDING FIELDS OF TABLE <fs_1>.
Please advise..it is very urgent.
Thanks,
Suvin

Using if logic in the where clause of a select statement

I have a select clause. And in the select clause there is a variable all_off_trt that can be 'Y' or 'N'.
In the where clause I want to make it so that if a form variable is checked and all_off_trt is 'Y' then
exclude it else if the form variable isn't checked then select it no matter what all_off_trt is.
Is there any way to include either and if statement or a case statement within the where clause to acheive this? If not is there another way of doing it?
Basically I am looking for a case statement like this
case
when all_off_trt = 'Y' and mail_para.code = 'Y' then false
else true
end
Message was edited by:
Tugnutt7

Ok, so that really doesn't solve my problem. I have 3 different fields that I need to do that with. Each combining in a select statement to print an email list, as well as other thing limiting the where clause.
This is currently what I have, tested and working 100%.
cursor email_cur is
select unique p.email,s.all_off_trt,s.all_deceased,s.no_enroll
from participant p, trialcom t, ethics s
where p.status='A'
and p.surname=t.surname
and p.initials=t.initials
and s.trial_cd = t.tricom
and s.centre = t.centre
and p.email is not null
and (t.centre in (select code from mail_parameters where user_name=user and mail_para='CENTRE')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='CENTRE'))
and (t.tricom in (select code from mail_parameters where user_name=user and mail_para='TRIAL')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='TRIAL'))
and (t.role in (select code from mail_parameters where user_name=user and mail_para='ROLE')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='ROLE'))
and (p.country in (select code from mail_parameters where user_name=user and mail_para='COUNTRY')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='COUNTRY'))
and (t.represent in (select code from mail_parameters where user_name=user and mail_para='REPRESENT')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='REPRESENT'));
This is in a program unit that runs when a button is clicked. At the end of that I need to add on the 3 case statements that help further narrow down the selection of emails to be printed. Then it prints the emails selected from this statement into a file. So it has to be done right in the select statement. The three table variables are the all_off_trt, all_deceased, and no_enroll. The form has 3 checkboxes. One for each, that when checked (giving the variable associated with the checkboxes a value of 'Y') excludes all emails that have a 'Y' in the coresponding table variable.

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 in the Select Clause

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