left join、inner join、right join的區別
sql的left join 、right join 、inner join之間的區別sql -left join(左聯接) 返回包括 左表中的全部記錄和右表中聯結字段相等的記錄 -right join(右聯接) 返回包括 右表中的全部記錄和左表中聯結字段相等的記錄 -inner join(等值鏈接) 只返回兩個表中聯結字段相等的行spa t_user表blog t_class表c
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