sql的left join 、right join 、inner join之间的区别
- 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
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