题解 | #查看不同年龄段的用户明细#
查看不同年龄段的用户明细
https://www.nowcoder.com/practice/ae44b2b78525417b8b2fc2075b557592
# 法一 ： case when
SELECT
distinct device_id,
gender,
(
case
when age < 20 then '20岁以下'
when age >= 20
and age <= 24 then '20-24岁'
when age >= 25 then '25岁及以上'
else '其他'
end
) as age_cut #
FROM
user_profile
法二 ： if
SELECT
distinct device_id,
gender,
if(
age >= 25,
'25岁及以上',
if(
age between 20 and 24,
'20-24岁',
if(age < 20, '20岁以下', '其他')
)
) as age_cut
FROM
user_profile
SELECT
distinct device_id,
gender,
(
case
when age < 20 then '20岁以下'
when age >= 20
and age <= 24 then '20-24岁'
when age >= 25 then '25岁及以上'
else '其他'
end
) as age_cut #
FROM
user_profile
法二 ： if
SELECT
distinct device_id,
gender,
if(
age >= 25,
'25岁及以上',
if(
age between 20 and 24,
'20-24岁',
if(age < 20, '20岁以下', '其他')
)
) as age_cut
FROM
user_profile
