Answer / guest

Cause: The number of expressions in an IN clause did not
equal the number of expressions in a corresponding subquery
select list. For example, the following statement is invalid
because the IN clause contains two expressions, but the
subquery select list contains just one: ... WHERE (ename,
sal) IN (SELECT sal FROM emp);

Action: Check the number of expressions in each set, then
revise the statement to make the numbers equal.

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