SELECt person_idFROM yourTableWHERe department = 'a' OR department = 'b'GROUP BY person_idHAVINg COUNT(DISTINCT department) = 2
注意：仅当一个人可以多次成为同一部门的成员时，才需要使用DISTINCT。
SELECt person_idFROM yourTableWHERe department = 'a' OR department = 'b'GROUP BY person_idHAVINg COUNT(DISTINCT department) = 2
注意：仅当一个人可以多次成为同一部门的成员时，才需要使用DISTINCT。
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