题解 | #统计每种性别的人数#
统计每种性别的人数
https://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
select substring_index(profile,',',-1) as gender, count(*) as number from user_submit group by gender
substring_index语法:substring_index(str,delim,count)
https://www.cnblogs.com/mqxs/p/7380933.html
每个性别:group by