题解 | #广告点击的高峰期#
广告点击的高峰期
https://www.nowcoder.com/practice/6756d65784f9413b8505c1d0c6754b3a
select click_hour, click_cnt
from (select hour(click_time) click_hour,
count(trace_id) click_cnt,
rank() over (order by count(trace_id) desc) click_rank
from user_ad_click_time
group by hour(click_time)) as t
where click_rank = 1
;
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