Question

In some SQL dialects, you can state (something as):

SELECT * FROM SomeTable WHERE (val1,val2) IN 
  (SELECT val1,val2 FROM SomeOtherTable)

But I don’t know how to do that in the TSQL (sql server 2k) I am using.

I am aware of (and using for now) workarounds like using joins or concatenated values,
but is there some syntax in TSQL I am overlooking to do just that?

UPDATE : This is valid SQL-99 syntax, that’s why I consider a join a workaround, even if it would be more performant. My question is maybe put better as :

Is there an implementation of this syntax in TSQL?

UPDATE2 : I just tested this syntax om Mysql and it works fine there.

Answer 1

SELECT  *
FROM    SomeTable st
WHERE   EXISTS
        (
        SELECT  1
        FROM    SomeOtherTable sot
        WHERE   sot.val1 = st.val1
                AND sot.val2 = st.val2
        )

This is actually what an IN construct is optimized to with any SEMI JOIN method.

As for your question,

Is there an implementation of this syntax in T-SQL?

the answer is no

As documentation says:

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