case 表达有问题

Question

SELECT ENAME,SAL,
    CASE SAL
        WHEN 'SAL<1000' THEN 'LOWER'
        WHEN 'SAL>1000' THEN 'HIGH'
    END
    RESULT FROM EMP;

This gives an error:

inconsistent datatypes: expected %s got %s

What should I do to fix my query?

Answer 1

Please try this.

SELECT ENAME,SAL,
    CASE WHEN SAL<1000 THEN 'LOWER'
         WHEN SAL>1000 THEN 'HIGH'
    END AS RESULT
FROM EMP;

Answer 2

I think you intend:

SELECT ENAME, SAL,
       (CASE WHEN SAL < 1000 THEN 'LOWER'
             WHEN SAL > 1000 THEN 'HIGH'
        END) as RESULT
FROM EMP;

There are two issues:

• You have single quotes around the comparisons. A string is not appropriate in this context.
• You have SAL right after CASE , which is also not appropriate.