题解 | 截取出年龄
截取出年龄
https://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
select
substring(profile, 12, 2) as age,
count(*) as number
from
user_submit
group by
age
order by
age desc;
substring_index(SUBSTRING_INDEX(profile,',',3),',',-1)
用两次截取的函数
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