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                LEFT JOIN 關鍵字從左表(table1)返回所有的行,即使右表(table2)中沒有匹配。如果右表中沒有匹配,則結果為 NULL。 ### SQL LEFT JOIN 語法 SELECT*column\_name(s)* FROM*table1* LEFT JOIN*table2* ON*table1.column\_name*\=*table2.column\_name*; 或: SELECT*column\_name(s)* FROM*table1* LEFT OUTER JOIN*table2* ON*table1.column\_name*\=*table2.column\_name*; **注釋:**在某些數據庫中,LEFT JOIN 稱為 LEFT OUTER JOIN。 ![](https://img.kancloud.cn/ee/bf/eebfab860e06294fa433983c090dd29a_200x145.png)
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