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数据-新手mysql问题,求大神解答

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Release: 2016-06-06 09:34:24
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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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