DEMO สำหรับต้องการความช่วยเหลือเกี่ยวกับการสืบค้น SQL ที่ซับซ้อน http//stackoverflow.com/q/4015915/119477ไม่จำเป็นต้องใช้ตารางทั้งหมด
DEMO for Need help with a complex SQL query. http//stackoverflow.com/q/4015915/119477It is not neccessary to use all the tables.
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