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
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