MySQL的排序不排序正确的数据

Question

我试图从SUMED列使用下面的查询基于我的查询记录进行排序：

SELECT o.id_customer, CONCAT(c.firstname, ' ', c.lastname) AS 'name', 
    COUNT(o.id_customer) AS 'repeat', FORMAT(SUM(o.total_products),2) AS 'amount' 
FROM ps_orders AS o 
LEFT JOIN ps_customer AS c ON o.id_customer = c.id_customer 
WHERE o.current_state IN (2,4,5) 
AND o.invoice_date BETWEEN '2015-01-01' AND '2015-12-31' 
GROUP BY o.id_customer 
ORDER BY amount DESC 

上面的查询没有返回正确的数据，更具体返回的记录未正确排序。

任何人都可以指向正确的方向吗？任何帮助深表感谢。

干杯

Answer 1

您格式化量与FORMAT方法

和FORMAT返回的字符串。

您的查询由数据类型的字符串，而不是数量

Answer 2

排序可能是什么的加入，导致该问题：以下引用可能引发一些想法： http://dev.mysql.com/doc/refman/5.7/en/left-join-optimization.html

Answer 3

你可以尝试使用子查询：

SELECT * 
FROM (
    SELECT o.id_customer, CONCAT(c.firstname, ' ', c.lastname) AS 'name', 
     COUNT(o.id_customer) AS 'repeat', FORMAT(SUM(o.total_products),2) AS 'amount' 
    FROM ps_orders AS o 
    LEFT JOIN ps_customer AS c ON o.id_customer = c.id_customer 
    WHERE o.current_state IN (2,4,5) 
    AND o.invoice_date BETWEEN '2015-01-01' AND '2015-12-31' 
    GROUP BY o.id_customer 
) AS o 
ORDER BY amount DESC