inner join/left join/right join/full join
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inner join 不以任何表为基准 只是返回查询条件中相等的结果
left join 以左表为基准加右表中的查询字段
right 同上
full join 左连接 和 右连接的并集
参考：http://www.cnblogs.com/pcjim/articles/799302.html
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