题解 | #截取出年龄#
截取出年龄
http://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
substring_index套娃解决
select age, count(age) FROM (select substring_index(substring_index(profile,',',-2),',',1) "age" from user_submit) t group by age order by age desc


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