| ERROR | column string exists in more than one table; use qualifier |
| CAUSE | The statement is ambiguous because it specifies two or more tables having the same column name. For example, the following statement is ambiguous because deptno is a column in both tables: SELECT deptno, loc INTO my_deptno, my_loc FROM emp, dept; |
| ACTION | Precede the column name with the table name (as in emp.deptno) so that the column reference is unambiguous. |