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
CASE
WHEN age<25 OR age IS null THEN "25岁以下"
else "25岁及以上"
END AS age_cut,
count(device_id) AS number
FROM user_profile
GROUP BY age_cut
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