select语句多表查询 怎么查询啊
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select * from Table1,Table2 where Table1.c=Table2.c(c是某一相同字段)
或者用内链接或者外联结:
selete * from Table1 as T1
inner join Table2 as T2
on T1.c=T2.c
外联接
selete * from Table1 as T1
left (right) join Table2 as T2
on T1.c=T2.c
或者用内链接或者外联结:
selete * from Table1 as T1
inner join Table2 as T2
on T1.c=T2.c
外联接
selete * from Table1 as T1
left (right) join Table2 as T2
on T1.c=T2.c
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