mysql查询（七）

多表联合查询     

and（和）

第一种：

命令：select ex_xueshengbiao_95.Sid,ex_xueshengbiao_95.Sname,ex_xueshengbiao_95.Sage,ex_xueshengbiao_95.Ssex

from ex_xueshengbiao_95,ex_kechengbiao_95, ex_jiaoshibiao_95,ex_chengjibiao_95

where ex_kechengbiao_95.Tid=ex_jiaoshibiao_95.Tid

and ex_kechengbiao_95.Cid=ex_chengjibiao_95.Cid

and ex_chengjibiao_95.Sid=ex_xueshengbiao_95.Sid

and ex_jiaoshibiao_95.Tname=‘张三‘

（2）第二种

命令：select * from ex_xueshengbiao_95

where Sid in (select Sid from ex_chengjibiao_95

where Cid in (select Cid from ex_kechengbiao_95

where Tid in (select Tid from ex_jiaoshibiao_95

where Tname=‘张三‘)))

mysql查询（七）

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