圖解SQL的inner join、left join、right join、full outer join、union、union all的區別
目錄 1.INNER JOIN 2.FULL [OUTER] JOIN 3.left[outer] join 4.RIGHT [OUTER] JOIN 5.UNION 與 UNION ALL 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 。left join是以A表的記錄爲基礎的,A可以看成左表,B可以看成右表,left join是以左表爲準的. right j
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