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[应用&技术] 分享MYSQL多表联合更新,查询

很多时候都会用到多表查询,更新,删除,替换.

MYSQL多表联合更新与SQL2000有所不同:


& V1 L3 q- K5 i1 l+ w- ~3 Dselect a.studnt_sno,b.sno,c.grade from studnt as a inner join depart as b on a.sno=b.sno left join sc as c on b.cno=c.no
2 L( O( X9 L3 j$ yselect col1, col2, col..., a.*, b.*,c.* from tableA a, tableB b,tableC c WHERE a.**_id = b.**_id AND b.**_id = c.**_id and a.**_id=c.**_id

update tableA,tableB set tableA.colB= tableB.colB  where tableA.colA= tableB.colA;


, D. v( Y3 n9 Y. C+ H7 F* x

对应的SQL2000更新语句为:

  update tableA set tableA.colB=tableB.colB from tableA,tableB where tableA.colA=tableB.colA


- |% C$ E- k5 a

更多的自己去扩展吧..

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