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问下这个 SQL 怎么写，订单表获取每个用户最后三个商品种类统计，另外，送一个洗牙券
source link: https://www.v2ex.com/t/679254
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问与答 - @undefind - 测试数据如下：```TicketID userid goods_id create_time11012451 1012 1 2020-06-01 11:11:111101
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