Query Builder doesn't qualify the column name (4280011)

The Query Builder is not qualifying columns which can cause an error when running some queries.

For example,

   SELECT emp_id
   FROM department, employee
   WHERE  (PERSON_ID = 69139)
   AND (department.emp_id = employee.emp_id)

Because emp_id exists on both tables, an error results because emp_id is ambiguously.

1. Go to Tools | Options | Database | Query Builder
2. On the right side check the following:

     a. Use fully qualified column names
     b. Use fully qualified object names