题解 | 截取出年龄

截取出年龄

https://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)

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