题解 | #截取出年龄#
截取出年龄
http://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
select
substring_index(substring_index(profile,',',-2),',',1) as age,count(device_id) as number
substring_index(substring_index(profile,',',-2),',',1) as age,count(device_id) as number
from user_submit group by age;
//详细看substring_index的使用规则
