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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:


+ i# ~* _% m, Q7 ]  y& O' Mselect 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
9 |, B: v( Y4 q6 gselect 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;


. t4 a) g; I2 t! S( ?

对应的SQL2000更新语句为:

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

& F+ z, J/ n6 R: l+ p

更多的自己去扩展吧..

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