题解 | #截取出年龄#

截取出年龄

https://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f

# 方法1
# select substring_index(substring_index(profile,',',-2),',',1) as age, count(device_id) as number from user_submit group by age, device_id

# 方法2
select substring(profile,12,2) as age ,count(device_id) from user_submit group by age, device_id

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