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数据-新手mysql问题，求大神解答
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- 2016-06-06 09:34:24810browse
mysql数据
一个上级对应多个下级，我根据上级id可以查出所有的下级。然后下级有个OPENID的字段对应订单表，我要拿到下级的所有订单数据，怎么查
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