Why it gives error in the case statement

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select empno, ename, sal, 
    case when deptno = 10 then ' Low Salary'
	when deptno = 20 then ' Middle Sal '
	when deptno = 30 then ' High Sal '
	else 0
	end
	from emp1

What I have tried:

when i am trying to write this error, it gives this error, i do not understand why it gives this error

Msg 245, Level 16, State 1, Line 14
Conversion failed when converting the varchar value ' Middle Sal ' to data type int.

Posted 5-Dec-21 3:14am

ali khan Dec2021

Updated 5-Dec-21 3:49am

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Richard MacCutchan 5-Dec-21 9:41am

You cannot select a string of text into an integer.

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Dave Kreskowiak · Accepted Answer · 2021-12-05T03:49:00

It's because deptno is a numeric field and you're trying to return a string OR a numeric 0 in place of it (see that ELSE clause.) That won't work.

You have to do something like this:

SQL

SELECT empno, ename, sal, "SalaryRange" = 
    CASE WHEN deptno = 10 THEN ' Low Sal '
        WHEN deptno = 20 THEN ' Middle Sal '
        WHEN deptno = 30 THEN ' High Sal '
        ELSE ' Unknown '
    END
FROM emp1