mysql三张表连接建立视图
三张表连接··A表的a字段对应B表的b字段,B表的b1字段对应C表的c字段
现在建立一个视图,可以同时看到三张表的所有信息·~
createorreplaceviewv_name as selectt1.*,t2.*,t3.* fromA表t1,B表t2,C表t3 wheret1.a=t2.bandt2.b1=t3.c
两表链接创建视图
CREATETABLE`aa_user`( `id`int(10)NOTNULL, `name`varchar(10)DEFAULTNULL, `age`int(10)DEFAULTNULL, PRIMARYKEY(`id`) )ENGINE=InnoDBDEFAULTCHARSET=utf8; INSERTINTO`aa_user`VALUES('1','zs','18'); INSERTINTO`aa_user`VALUES('2','ls','20'); INSERTINTO`aa_user`VALUES('3','ww','19'); CREATETABLE`tb`( `id`int(10)NOTNULL, `fid`int(10)DEFAULTNULL, `cc`int(10)DEFAULTNULL, PRIMARYKEY(`id`) )ENGINE=InnoDBDEFAULTCHARSET=utf8; INSERTINTO`tb`VALUES('1','1','60'); INSERTINTO`tb`VALUES('2','1','70'); INSERTINTO`tb`VALUES('3','2','80'); INSERTINTO`tb`VALUES('4','2','90');
创建视图
CREATEorREPLACEviewaa_ta_viewAS selecta.*,b.fid,b.ccfromaa_usera,tbb wherea.id=b.fid;