MySQL表連接查詢

學習網址：MySQL表連接查詢，寫這篇文章只是爲了保存這個網址 答案： select DISTINCT c1.seat_id FROM cinema c1 LEFT JOIN cinema c2 ON ABS(c1.seat_id-c2.seat_id)=1 where c1.free=1 and c2.free=1 ORDER BY c1.seat_id      順便說一下，ABS(X)函數的

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