Question

Is it possible to include in a IN clause multiple fields? Something like the following:

select * from user
where code, userType in ( select code, userType from userType )

I’m using ms sql server 2008

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I know this can be achieved with joins and exists, I just wanted to know if it could just be done with the IN clause.

Answer 1

Not the way you have posted. You can only return a single field or type for IN to work.

From MSDN (IN):

test_expression [ NOT ] IN 
    ( subquery | expression [ ,...n ]
    ) 

subquery - Is a subquery that has a result set of one column. 
           This column must have the same data type as test_expression.

expression[ ,... n ] - Is a list of expressions to test for a match. 
                       All expressions must be of the same type as 
                       test_expression.

Instead of IN, you could use a JOIN using the two fields:

SELECT U.* 
FROM user U
  INNER JOIN userType UT
    ON U.code = UT.code
    AND U.userType = UT.userType