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(*) as number
from user_submit
group by age;
substring_index() 受到上一题老哥的启发直接写出来了
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