employee (empId,empName,empDept) customer(custId,custName,salesRepId,rating) salesRepId is a foreign key referring to empId of the employee relation. Assume that each employee makes a sale to at least one customer. What does the following query return?
FROM employee E
WHERE NOT EXISTS (SELECT custId
FROM customer C
WHERE C salesRepId =
AND C rating < > ‘GOOD’); [GATE 2014]