left join、inner join、right join及笛卡尔积解释
转自：https://www.cnblogs.com/rainman/archive/2013/04/27/3046124.html#m5html 一、表结构 二、Left Join 三、Right Join 四、Inner Join 五、表的关联修改和删除 六、笛卡尔积 一、表结构 表A 表B 二、Left Join 示例：
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