查询test表按group_id分组取sort_id前100个SELECT id AS '原数据ID',group_id AS '分组ID',sort_id AS '排序条件',num AS '排名'
查询test表按group_id分组取sort_id前100个
SELECT id AS '原数据ID',group_id AS '分组ID',sort_id AS '排序条件',num AS '排名'FROM (SELECT @row_number := CASE WHEN @customer_no = group_id THEN @row_number + 1 ELSE 1 END AS num /*如果同group_id那么排名加1,否则更新为1*/ ,@customer_no := group_id AS group_id /*重新加载group_id*/ ,id , sort_id /*原有数据*/ FROM test,( SELECT @customer_no := 0,@row_number := 0) AS t ORDER BY group_id ,sort_id DESC ,id)a WHERE num<=100
