日期:2014-05-16 浏览次数:20486 次
?? 表a
表b
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?左连接 ?select * from a left join b on a.aid=b.bid
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?右连接?select * from a right join b on a.aid=b.bid?
?
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内连接:select * from a inner join b on a.aid=b.bid?
?
?
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全连接:select * from a full join b on a.aid=b.bid?
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交叉连接:select * from a cross join b?
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