leftjoin中using和or是不是只能选其中一个
http://www.cnblogs.com/hhqinliang/p/8871802.html http://www.cnblogs.com/hhqinliang/p/8872874.html http://www.cnblogs.com/hhqinliang/p/8871842.html http://www.cnblogs.com/hhqinliang/p/8871849.html
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