题解 | #计算25岁以上和以下的用户数量#
计算25岁以上和以下的用户数量
https://www.nowcoder.com/practice/30f9f470390a4a8a8dd3b8e1f8c7a9fa
SElECT "25岁以下" AS age_cut,count(device_id) AS number FROM user_profile WHERE age<25 OR age IS null UNION ALL SELECT "25岁及以上" AS age_cut,count(device_id) AS number FROM user_profile WHERE age>=25;