题解 | #截取出年龄#使用两次substring_index函数进行截取
截取出年龄
http://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
select
substring_index(substring_index(profile,',',-2), ',', 1) AS age,
count(*) AS number
from user_submit
GROUP BY age
substring_index(substring_index(profile,',',-2), ',', 1) AS age,
count(*) AS number
from user_submit
GROUP BY age