| ERROR | IN clause must contain same number of expressions as subquery |
| 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. |