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เล่นอัตโนมัติ
เล่นใหม่
SELECT employee_id, department_idFROM employeesGROUP BY employee_idHAVING COUNT(employee_id) = 1UNIONSELECT employee_id, department_idFROM employeesWHERE primary_flag = 'Y';
SELECT employee_id, department_id
FROM employees
GROUP BY employee_id
HAVING COUNT(employee_id) = 1
UNION
SELECT employee_id, department_id
FROM employees
WHERE primary_flag = 'Y';