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 DATE_FORMAT(click_time,'%H') click_hour,count(*) click_cnt from user_ad_click_time GROUP BY DATE_FORMAT(click_time,'%H') ORDER BY click_cnt DESC LIMIT 1