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case statment in oracle

Hi I have a question in using case statement in Oracle.Like is it possible can we use queries in when clause and then clause in case statement. Like
select AMOUNT1,
(CASE WHEN (select amount1 from emp where amount LIKE '%J%') THEN (select CONCAT('-',TRUNC(TO_NUMBER(REPLACE('0000116J','J','1'))/100,2)) from dual)
ELSE 'AMOUNT' END) Amount from emp;

Help me out!!!!!!!!
Apr 17 '07 #1
2 1888
chandu031
78 Expert
Hi,

You can use a SELECT in the THEN clause of a case statement but you can't use it in the WHEN clause. The WHEN clause expects a condition which is evaluated to either TRUE or FALSE. There has to be a comparison of two parameters.
Apr 17 '07 #2
debasisdas
8,127 Expert 4TB
The expression u pass to WHEN should evalute to some BOOLEAN value
ans since in oracle SQL does not support BOOLEAN ,no query will evalute to BOOLEAN values
so u cant pass queries here.
but u can do that at THEN part ,because that is what u want ot display when the condition satisfies.
Apr 28 '07 #3

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