Case with select into and sub query

Question

hi im trying to use case and select with sebqueries, but my beginer like understanding of syntax fails me. can someone point out what im doing wrong in the case select below. im using select into, as i ultimatly need to load a ref cursor for use with crystal reports.
thanks
james
ps if anyone is london based, and would like to spend a day or two teaching me how to be a bit better at PL/SQL (can aford to pay a little bit) please get in touch!!
SELECT
Case (select kind_code from event where                    
event.event_id = event.container_event_id)     
when 1094006
then          promo_name     
end
into      result
FROM promo,     promo_plan ,     event_promotion
WHERE      promo.promo_id = promo_plan.promo_id
AND     promo_plan.promo_plan_id = event_promotion.promo_plan_id
AND     event_promotion.detail_id = '33532282'
when blah then 'blah';

Answer 1

Hello
AH i see what you are driveing at, yes i am just using case slect to determin which >routine to run, as the name is stored in a diferent location depending on the event kind >code. are are you saying i need multiple selects within the case statment? one for each >type of kind code?Well it depends really. If the select
select kind_code from event where
event.event_id = event.container_event_idIs going to return more than one row for any given run, you're going to need to take a bit of a different approach. Is it the case that this query will return more than one row which would mean that you want value X and value Y for each row?
Using the test data and everything from before:
SQL> CREATE OR REPLACE PROCEDURE p_GetStuff(ac_Result   OUT sys_refcursor)
  2  IS
  3
  4  BEGIN
  5     /*
  6             This uses a cartesian product i.e. repeat every row in
  7             dt_test_data against every row in dt_test_event
  8     */
  9     OPEN Ac_Result FOR
10     SELECT
11             CASE dt_test_event.kind_code
12             WHEN 1 THEN
13                     dt_test_data.object_name
14             WHEN 2 THEN
15                     dt_test_data.object_type
16             END
17     FROM
18             dt_test_data,
19             dt_test_event;
20
21  END;
22  /
Procedure created.
SQL> var x refcursor
SQL> exec p_getstuff(:x)
PL/SQL procedure successfully completed.
SQL> print x
CASEDT_TEST_EVENT.KIND_CODEWHEN1THENDT_TEST_DATA.OBJECT_NAMEWHEN2THENDT_TEST_DAT
ABC
ABC4
AD1
AD2
ADHOC_CONTACT_LOG
AK_CD_CLAIM_VALIDATION_SOURCE
AK_CD_CLAIM_VALIDATION_TYPE
AK_CLAIM_ACTION_ROWSOURCE
APPROVAL_LIST_MEM_IE
APPROVE_GRP_HIST_IE
10 rows selected.
SQL> insert into dt_test_event values(2);
1 row created.
SQL> exec p_getstuff(:x)
PL/SQL procedure successfully completed.
SQL> print x
CASEDT_TEST_EVENT.KIND_CODEWHEN1THENDT_TEST_DATA.OBJECT_NAMEWHEN2THENDT_TEST_DAT
ABC
ABC4
AD1
AD2
ADHOC_CONTACT_LOG
AK_CD_CLAIM_VALIDATION_SOURCE
AK_CD_CLAIM_VALIDATION_TYPE
AK_CLAIM_ACTION_ROWSOURCE
APPROVAL_LIST_MEM_IE
APPROVE_GRP_HIST_IE
TABLE
CASEDT_TEST_EVENT.KIND_CODEWHEN1THENDT_TEST_DATA.OBJECT_NAMEWHEN2THENDT_TEST_DAT
TABLE
TABLE
TABLE
TABLE
INDEX
INDEX
INDEX
INDEX
INDEX
20 rows selected.Or an alternative to that would be, if you have a fixed number of event ids and they relate to a fixed number of attributes you could use something like:
CREATE OR REPLACE PROCEDURE p_GetStuff3(ac_Result     OUT sys_refcursor)
IS
BEGIN
          The SUBSTR
          is just there to make sure the data fit on screen, my SQL*Plus
          is a bit weird!
     OPEN Ac_Result FOR
     SELECT
          SUBSTR(MAX(DECODE(dt_test_event.kind_code,1,dt_test_data.object_name,NULL)),1,30) attribute_1,
          SUBSTR(MAX(DECODE(dt_test_event.kind_code,2,dt_test_data.object_type,NULL)),1,30) attribute_2
     FROM
          dt_test_data,
          dt_test_event
     GROUP BY
          object_name;
END;
SQL> delete from dt_test_event where kind_code=2;
1 row deleted.
SQL> exec p_getstuff3(:x)
PL/SQL procedure successfully completed.
SQL> print x
ATTRIBUTE_1                    ATTRIBUTE_2
ABC
ABC4
AD1
AD2
ADHOC_CONTACT_LOG
AK_CD_CLAIM_VALIDATION_SOURCE
AK_CD_CLAIM_VALIDATION_TYPE
AK_CLAIM_ACTION_ROWSOURCE
APPROVAL_LIST_MEM_IE
APPROVE_GRP_HIST_IE
10 rows selected.
SQL> insert into dt_test_event values(2);
1 row created.
SQL> exec p_getstuff3(:x)
PL/SQL procedure successfully completed.
SQL> print x
ATTRIBUTE_1                    ATTRIBUTE_2
ABC                            TABLE
ABC4                           TABLE
AD1                            TABLE
AD2                            TABLE
ADHOC_CONTACT_LOG              TABLE
AK_CD_CLAIM_VALIDATION_SOURCE  INDEX
AK_CD_CLAIM_VALIDATION_TYPE    INDEX
AK_CLAIM_ACTION_ROWSOURCE      INDEX
APPROVAL_LIST_MEM_IE           INDEX
APPROVE_GRP_HIST_IE            INDEX
10 rows selected.Message was edited by:
david_tyler
Oops, copy + pasted the wrong comments for the 2nd proc.