[英]MYSQL - Get User and Most Recent Purchase Data
我正在尝试进行MYSQL查询,以获取用户的最新购买信息,然后查看是否符合特定条件。 这是我整理的查询:
select
users_purch.purch_date as purchase_date,
users_purch.total_amount as purchase_amount,
users.*
from
users
left join
(
select
max(date) as purch_date,
user_id,
total_amount
from
users_purchases
group by
user_id
) as users_purch
on users_purch.user_id = users.id
where
users_purch.purch_date < '2016-11-01'
and users_purch.total_cost < 112.49
order by
users_purch.purch_date desc
该查询似乎有效,但在某些方面失败。 例如,如果用户有多个购买条目,则它获取的是最大日期,但查询检索到的total_cost金额与最大日期不在同一行。 我如何重写此查询以提供完整的最新购买记录?
谢谢!
您必须再次加入user_purchases
表才能获取有关日期的信息:
select
users_purch.purch_date as purchase_date,
users_purch.total_amount as purchase_amount,
users.*
from
users
left join
(
select
max(date) as purch_date,
user_id
from
users_purchases
group by
user_id
) as users_purch
on users_purch.user_id = users.id
left join
(
select
user_id,
date,
total_amount
from
users_purchases
) as users_purch2 on users_purch.user_id = users_purch2.user_id and
users_purch2.date = users_purch.purch_date
where
users_purch.purch_date < '2016-11-01'
and users_purch.total_cost < 112.49
order by
users_purch.purch_date desc
由于您在此选择中的分组
如果您需要重写max(date)的数量以保护适当的数量
select
users_purch.purch_date as purchase_date,
users_purch.total_amount as purchase_amount,
users.*
from
users
left join
(
select t1.purch_date, t1.user_id, t2.total_amount from (
select
max(date) as purch_date,
user_id
from users_purchases
group by user_id ) t1
inner join (
date,
user_id,
total_amount
from users_purchases
) t2 on t1.user_id= t2.user_id, t1.purch_date = t2.date
) as users_purch
on users_purch.user_id = users.id
where
users_purch.purch_date < '2016-11-01'
and users_purch.total_cost < 112.49
order by
users_purch.purch_date desc
您可以试试这个,伙计:
SELECT
up.date AS 'purchase_date',
up.total_amount AS 'purchase_amount',
u.*
FROM
users u
INNER JOIN users_purchases up ON up.user_id = u.user_id
INNER JOIN (
# get max date per user_id
SELECT user_id, max(date) AS 'purch_date'
FROM users_purchases
GROUP BY user_id
) max_up ON
max_up.user_id
# join that date to get the correct total_amount
AND max_up.`purch_date` = up.`date`
WHERE
up.`date` < '2016-11-01'
AND up.total_amount < 112.49
GROUP BY u.user_id
ORDER BY up.`date` DESC;
注意
user_id
日期 total_amount
值 user_id
分组 users_purchases
降序users_purchases
。 date
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.