题解 | #截取出年龄#
截取出年龄
https://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
方法一：
select
substring_index(substring_index(profile,',',3),',',-1) age,
count(device_id) number
from user_submit
group by age
方法二：
select substring_index(substring_index(profile,',',-2),',',1) age,
count(device_id) number
from user_submit
group by age
