[英]SQL - Find % of users who made purchase in Feb 2020
我有 2 個表:
Table A: User (users who made purchase) - user_id, date, product_id
Table B: Country - user_id, country
我想知道美國 2 月份購買的用戶百分比
我認為下面的查詢應該可以工作,但是我的朋友警告我它可能無法按預期工作(可能會得到額外的記錄/行)。所以我只是想在這里與專家再次核實:)
select count(distinct b.user_id) / count(distinct a.user_id)
from country a
left join user b on a.user_id = b.user_id and date_trunc('month',date) = '2020-02-01' --don't worry about the date format
where a.country = 'US'
謝謝!
您可以使用條件聚合
select (count(distinct case when date_trunc('month',date) = '2020-02-01' then u.user_id) * 1.0 /
count(distinct u.user_id)
) as ratio
from country c join
user u
on c.user_id = u.user_id a
where c.country = 'US'
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