题解 | 截取出年龄
截取出年龄
https://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
select
t.age,
count(t.age) number
from
(
select
substring(u.profile, 12, 2) age
from
user_submit u
) as t
group by
t.age;
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