Question

我想不显示我的查询中是否有重复的id_customer，

 id_customer    firstname   lastname    email   total_paid
--------------------------------------------------------
55  name8   name10  ***@windowslive.com 88.90
58  name6   name7   ****@hotmail.com    78.90
59  name3   name5   ****@hotmail.com    123.83
60  name    name2   ****@hotmail.com    78.90

我正在使用＆＃34; group by＆＃34;但它并没有显示出来。我希望它不会显示任何东西，甚至

显示如下

SELECT
    ps_orders.id_customer,
    ps_customer.firstname,
    ps_customer.lastname,
    ps_customer.email,
    ps_orders.total_paid
FROM
    ps_orders
    RIGHT JOIN ps_customer 
        on ps_orders.id_customer = ps_customer.id_customer
WHERE
    ps_orders.total_paid > 1
ORDER BY
    ps_orders.id_customer;

第一个查询是这样的，

 id_customer    firstname   lastname    email   total_paid
--------------------------------------------------------
55  name8   name10  ***@windowslive.com 88.90
58  name6   name7   ****@hotmail.com    56.00
58  name6   name7   ****@hotmail.com    87.90
58  name6   name7   ****@hotmail.com    79.99
58  name6   name7   ****@hotmail.com    78.90
59  name3   name5   ****@hotmail.com    123.83
60  name    name2   ****@hotmail.com    78.90

没有分组

 id_customer    firstname   lastname    email   total_paid
--------------------------------------------------------
55  name8   name10  ***@windowslive.com 88.90
59  name3   name5   ****@hotmail.com    123.83
60  name    name2   ****@hotmail.com    78.90

但我希望看到这样的

Sum(CASE WHEN attempt.result = 0 THEN 0 ELSE 1 END) as Count,

Answer 1

试试这个：

SELECT
    ps_orders.id_customer,
    ps_customer.firstname,
    ps_customer.lastname,
    ps_customer.email,
    ps_orders.total_paid
FROM
    ps_orders
    JOIN ps_customer 
        on ps_orders.id_customer = ps_customer.id_customer
WHERE
    ps_orders.total_paid > 1
    AND ps_orders.id_customer IN (  SELECT  ps_orders.id_customer
                                    FROM    ps_orders
                                    GROUP BY ps_orders.id_customer
                                    HAVING COUNT(1) < 2 )

Answer 2

您需要检查SELECT ps_orders.id_customer, ps_customer.firstname, ps_customer.lastname, ps_customer.email, ps_orders.total_paid FROM ps_orders RIGHT JOIN ps_customer on ps_orders.id_customer = ps_customer.id_customer GROUP BY ps_orders.id_customer HAVING COUNT(*)=1：

Personal Github 13-5

MyController

MySQL查询不显示重复的ID

2 个答案: