多表聯查，兩表之間相互關聯，不必定須要有主外鍵關係，字段匹配就行

Set @dlr = 15001; SELECT school.name AS schoolName, xq.xqmc AS xqmc, qy.mc as qymc, ly.bz as lymc, fj.bz as fjmc FROM t_xsgy_ssap ssap                 LEFT JOIN t_xsgy_cwgl cwgl ON cwgl.id=ssap.cwid  

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