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(*) AS number
FROM user_profile
WHERE age < 25 OR age IS NULL
UNION
SELECT
'25岁及以上' AS age_cut,
COUNT(*) AS number
FROM user_profile
WHERE age >= 25
