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
SELECT '25岁及以上' as age_cut,
COUNT(device_id) as number
FROM user_profile
WHERE age >= 25;
记录一下，通过UNION和直接选字符串的形式实现
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