SQL中的join连接查询(left join/right join/inner join)
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SQL中left join/right join/inner join区别
left join(左联接) 返回包括左表中的所有记录和右表中联结字段相等的记录
right join(右联接) 返回包括右表中的所有记录和左表中联结字段相等的记录
inner join(等值连接) 只返回两个表中联结字段相等的行
参考地址:http://www.cnblogs.com/pcjim/articles/799302.html
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