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
也不是那么好用:如果要取中间的元素,还需要嵌套。。