题解 | #统计每种性别的人数#
统计每种性别的人数
http://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
两种写法、
select if(right(profile,5)=',male','male','female') as gender, count(device_id) as number from user_submit group by gender select substring_index(profile,',',-1) as gender, count(device_id) as number from user_submit group by gender
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