Oracle SQL查询中的条件

Question

I have a query like

 select * from emp where emp.id in(1,2,3) and emp.sal>10000

I need to add a logic to the check emp.sal>10000 only if design.type='Labor', I tried like the below but not working

select * from emp,design where emp.id in(1,2,3) and case when design.type='Labor' then emp.sal>10000 

Can we implement this ?

Answer 1

Simple:

select * from emp where emp.id in(1,2,3) and (design.type<>'Labor' OR emp.sal>10000)

If design.type='Labor' then emp.sal must be greater than 10000 for the condition to be true.

Answer 2

This should work for you...

SELECT * FROM emp 
WHERE emp.id IN (1,2,3) 
   AND ((design.type = 'Labor' AND emp.sal>10000) 
        OR (design.type <> 'Labor'))

The simplification of the OR condition would be..

SELECT * FROM emp 
WHERE emp.id IN (1,2,3) 
   AND (design.type <> 'Labor' OR emp.sal > 10000)

Answer 3

You want to query rows that have a salary higher than 10000 only when the type is labor for completion's sake, we will also state that for different type s we don't care about the salary. If we put this formally, we'll get:

(type = 'Labor' and salary > 10000) OR (type != 'Labor')

This boolean expression can of course be simplified - we're looking for rows that either have a type different than Labor or a salary higher than 10000:

(salary > 10000) OR (type != 'Labor')

So if we put it all together:

SELECT *
FROM   emp 
WHERE  (emp.id IN (1,2,3)) AND (type != 'Labor' OR sal > 10000)

Answer 4

  Try this.
  select * from 
  (
    select * from emp where id in (1,2,3) and design.type='Labor'
  )a
  where a.sal>10000;