MySQL表连接查询

学习网址：MySQL表连接查询，写这篇文章只是为了保存这个网址 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      顺便说一下，ABS(X)函数的

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