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(id) AS number FROM user_profile WHERE age <25 or age is null UNION SELECT '25岁及以上' AS age_cut ,count(id) AS number FROM user_profile WHERE age>=25
不能写成age=null,要写成age is null
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