mysql中的left join, right join,mysqljoin

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mysql中的left join, right join,mysqljoin

left (outer) join:左表為主,包含左表的所有行,右表滿足記錄的資料列出

right (outer) join:右表為主,包含右表的所有行,左表滿足記錄的資料列出

cross join:笛卡爾積(所有可能的行組合)。

inner join:滿足串連條件的cross組合。

full outer join:left outer 和 right outer所有行的超集。



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