题解 | #截取出年龄#
截取出年龄
https://www.nowcoder.com/practice/b8d8a87fe1fc415c96f355dc62bdd12f
# 方法1 # select substring_index(substring_index(profile,',',-2),',',1) as age, count(device_id) as number from user_submit group by age, device_id # 方法2 select substring(profile,12,2) as age ,count(device_id) from user_submit group by age, device_id

查看1道真题和解析
海康威视公司福利 1154人发布
