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
age_cut,
count(device_id) as number
from
(
select
if (ifnull (age, 0) < 25, "25岁以下", "25岁及以上") as age_cut,
device_id
from
user_profile
) t1
group by
age_cut;
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