sql 各种 join的区别 left join,right join,inner join,full outter join
left join以左表为主，同时显示左右表的内容，右表不存在的字段显示null right join以右表为主，同时显示两个表的内容，左表不存在的字段显示null inner join，只显示符合条件的交集
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