Question

如标题中所述，此问题已被删除。

Answer 1

这将为您提供每个user_id的前7天记录

SELECT orders.* FROM orders
INNER JOIN (
    select user_id, min(created_on) as mindt from orders group by user_id
) t
ON orders.user_id = t.user_id AND orders.created_on <= DATE_ADD(t.mindt, INTERVAL 7 DAY)
ORDER BY user_id, created_on

对于每个用户的平均paid_amount，在前7天，请使用：

SELECT orders.user_id, avg(paid_amount) FROM orders
INNER JOIN (
    select user_id, min(created_on) as mindt from orders group by user_id
) t
ON orders.user_id = t.user_id AND orders.created_on <= DATE_ADD(t.mindt, INTERVAL 7 DAY)
group by orders.user_id

这里曾经有过Q

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