mysql之left join、right join、inner join、
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 left join图例 inner join图例 right join图例 left join/right join VS inner join (1). on与 w
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相关文章
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