mysql分组,取每组前几条记录

    xiaoxiao2021-04-17  41

    SELECT * FROM 表名 a WHERE (SELECT count(*) FROM 表名 b WHERE b.日期=a.日期 AND b.id>a.id )<5 ORDER BY 日期 asc,id desc

    对上面数据按照日期分组,每组取qty_ordered最大的前5条:(注意因为我这里条件特殊,所以取5条,写<10)

    SELECT * from sales_bestsellers_aggregated_daily AS t1 where (SELECT COUNT(*) FROM sales_bestsellers_aggregated_daily AS t2 WHERE t2.period=t1.period AND qty_ordered>t1.qty_ordered) < 10 AND period >= '2016-03-01' AND period <= '2016-03-02' AND store_id=1 ORDER BY t1.period,t1.qty_ordered DESC;结果如图:

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