คำอธิบายประเภทบริการที่มีทั้งผลิตภัณฑ์ภาพถ่ายและผลิตภัณฑ์ฟิล์มคืออะไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the description of the service type which offers both the photo product and the film product?It is not neccessary to use all the tables.
 Ref_Service_Types:  (Service_Type_Description [ VARCHAR ] Service_Type_Code [ VARCHAR) ]
SELECT T1.Service_Type_Description FROM Ref_Service_Types AS T1 JOIN Services AS T2 ON T1.Service_Type_Code = T2.Service_Type_Code WHERE T2.Product_Name = 'photo' INTERSECT SELECT T1.Service_Type_Description FROM Ref_Service_Types AS T1 JOIN Services AS T2 ON T1.Service_Type_Code = T2.Service_Type_Code WHERE T2.Product_Name = 'film'