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(*)
FROM user_profile
WHERE age < 25 OR age IS NULL
UNION
SELECT
'25岁及以上' AS age_cut,
COUNT(*)
FROM user_profile
WHERE age >= 25
UNION合并两个查询结果
