mysql练习--统计每种性别的人数

描述

题目：现在运营举办了一场比赛，收到了一些参赛申请，表数据记录形式如下所示，现在运营想要统计每个性别的用户分别有多少参赛者，请取出相应结果

 

示例：user_submit

device_id	profile	blog_url
2138	180cm,75kg,27,male	http:/url/bigboy777
3214	165cm,45kg,26,female	http:/url/kittycc
6543	178cm,65kg,25,male	http:/url/tiger
4321	171cm,55kg,23,female	http:/url/uhksd
2131	168cm,45kg,22,female	http:/urlsydney

 

根据示例，你的查询应返回以下结果：

gender	number
male	2
female	3

select if(profile like "%female","female","male")gender, count(*) as number
from user_submit
group by gender

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

select substring_index(profile,',',-1)gender,count(*)number
from user_submit
group by gender