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

CASE-WHEN解法:

需要注意!!!如果直接用profile like "%male"语句进行条件筛查会出问题!因为female中也含有male,会导致判断错误

select 
case
    when profile like "%,male" then 'male'
    when profile like "%,female" then 'female'
end as gender,count(*) as number
from user_submit
group by gender

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