How to write subquery in case when clause?

Question

It seems impossible to add a subquery in a CASE statement.

SELECT CASE WHEN Column1 IN (SELECT Column2 FROM Table2) 
            THEN 'Y'ELSE 'N' END
FROM Table1

Any suggestions?

Answer 1

Hi @Y.N Try this:

SELECT CASE WHEN EXISTS (SELECT 1 FROM Table2 B WHERE B.Column2 = A.Column1) 
            THEN 'Y' ELSE 'N' END
FROM Table1 A

Best regards,

Cosmog Hong

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