| ERROR | different types of columns in UNION, INTERSECT, or MINUS expression |
| CAUSE | The select lists to the left and right of a UNION, INTERSECT, or MINUS expression select at least one column that is mismatched in datatype. For example, the following statement is faulty because the constant 3 has datatype NUMBER, whereas SYSDATE has datatype DATE: CURSOR my_cur IS SELECT 3 FROM emp INTERSECT SELECT SYSDATE FROM emp; |
| ACTION | Change the select lists so that they match in datatype. You might want to use datatype conversion functions in the select list of one or more queries. |