通过一次查询获取最后订单日期,总订单和总金额?

时间:2013-10-22 11:22:47

标签: mysql sql

我首先计划使用多个查询和一些PHP来执行此操作。

我想要做的是抓住上次特定用户下订单,用户拥有的总订单数量,以及他支付的总金额/成本/数量。

我试过的是这个SQL:

SELECT `orders`.`date_created`, 
SUM(total_count) as total_sum, 
COUNT(id) AS total_orders 
FROM `orders` 
WHERE `user_id` = '96838' 
AND (`status` = 'new' OR `status` = 'delivered') 
ORDER BY `orders`.`date_created` DESC
LIMIT 1

我对此的期望是:

total_sum = total count/amount of all the orders that the user has.
total_orders = total orders
date_created = grab the last orders date_created, so we can know when the last time was.

当我今天运行上面的SQL时,我确实收到了正确的total_sum和total_orders值,但是date_created是错误的(它选择了第一个订单而不是最后一个订单?)

是否需要“限制1”?

1 个答案:

答案 0 :(得分:1)

如果我了解你之后的事情,你就不需要分组 - 只需获得最长日期:

SELECT
    MAX(date_created) as last_order_date, 
    SUM(total_count) as total_sum, 
    COUNT(id) AS total_orders 
FROM
    `orders` 
WHERE
    `user_id` = '96838' 
    AND
    `status` IN ('new', 'delivered')