left join、inner join、right join的區別
sql的left join 、right join 、inner join之間的區別 -left join(左聯接) 返回包括左表中的所有記錄和右表中聯結字段相等的記錄 -right join(右聯接) 返回包括右表中的所有記錄和左表中聯結字段相等的記錄 -inner join(等值連接) 只返回兩個表中聯結字段相等的行
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相關文章
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