题解 | 输出在5min内完成点击购买的用户ID

select c.user_id uid
from user_ad_click_time c
left join user_payment_time p
on c.trace_id=p.trace_id
and c.user_id=p.user_id
where timestampdiff (minute, c.click_time, p.pay_time)<=5
order by uid desc

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