CASE IN statement with multiple values

Question

Is there a way to make a CASE statement with an IN clause?

SELECT
CASE c.Number
IN (\'1121231\',\'31242323\') THEN 1
IN (\'234523\',\'2342423\') THEN 2
END A         


        

Answer 1

The question is specific to SQL Server, but I would like to extend Martin Smith's answer.

SQL:2003 standard allows to define multiple values for simple case expression:

SELECT CASE c.Number
          WHEN '1121231','31242323' THEN 1
          WHEN '234523','2342423' THEN 2
       END AS Test
FROM tblClient c;

It is optional feature: Comma-separated predicates in simple CASE expression“ (F263).

Syntax:

CASE 
     WHEN [,  ...] THEN 
    [WHEN [,  ...] THEN 
     ...]
    [ELSE ]
END

As for know I am not aware of any RDBMS that actually supports that syntax.