Select语句 - 只有当条件

采取如下表一看：Select语句 - 只有当条件

Status ----------------- Email 
Approved [email protected] 
Canceled --------------- [email protected] 
Canceled --------------- [email protected] 
Canceled --------------- [email protected] 
Canceled --------------- [email protected]

我执行查询

"SELECT DISTINCT Status, Email FROM dbo.sales": 

Status ----------------- Email 
Approved --------------- [email protected] 
Canceled [email protected] 
Canceled --------------- [email protected]

我想建立一个查询，选择具有行状态“已取消”，只有当没有同一电子邮件的状态为“已批准”时。

换句话说，在本例中，我只选择最后一项（取消 - [email protected]）。

可能吗？提前致谢。

来源

2014-03-01 user3367290

Select distinct status,email 
From dbo.sales 
Where email Not In (select email from dbo.sales 
         Where status='Approved')

来源

2014-03-01 04:03:46

试试这个

Select Status, Email 
FROM dbo.sales 
WHERE Status = 'Canceled' AND 
NOT EXIST(Select Status, Email FROM dbo.sales Where Status='Approved') 
GROUP BY Status, Email

来源

2014-03-01 04:13:19

假设你只有 '认可' 和 '取消' 作为状态列中的值：

select status, email from dbo.sales 
where email not in (select email from dbo.sales where status = 'Approved') 
group by email

来源

2014-03-01 04:17:55 onelesd

您可以使用下面的查询：

方法1：

SELECT DISTINCT t.status, t.email 
FROM dbo.test t 
LEFT JOIN (SELECT * FROM test WHERE STATUS = 'Approved')z ON z.email = t.email 
WHERE t.STATUS = 'Canceled' 
    AND z.STATUS IS NULL

方法2：

SELECT DISTINCT status, email 
FROM dbo.sales t 
WHERE t.STATUS = 'Canceled' 
    and t.email Not In ( SELECT email 
         FROM dbo.sales 
         WHERE status='Approved')

来源

2014-07-05 10:52:45

如果这是关于取消邮件而已，你可以尝试，除了：

SELECT Email FROM dbo.sales WHERE Status = 'Canceled' 
EXCEPT 
SELECT Email FROM dbo.sales WHERE Status = 'Approved' 
;

，或者，如果Status必须包括在输出：

SELECT Status,  Email FROM dbo.sales WHERE Status = 'Canceled' 
EXCEPT 
SELECT 'Canceled', Email FROM dbo.sales WHERE Status = 'Approved' 
;

如果您确实想要显示始终被批准或始终被取消的电子邮件，则有一种方法是o重复上述逻辑对于每个子集：

(
SELECT Status,  Email FROM dbo.sales WHERE Status = 'Canceled' 
EXCEPT 
SELECT 'Canceled', Email FROM dbo.sales WHERE Status = 'Approved' 
) 
UNION ALL 
(
SELECT Status,  Email FROM dbo.sales WHERE Status = 'Approved' 
EXCEPT 
SELECT 'Approved', Email FROM dbo.sales WHERE Status = 'Canceled' 
) 
;

然而，或者，可以尝试分组和在各组计数不同Status值：

SELECT 
    MIN(Status) AS Status, 
    Email 
FROM 
    dbo.sales 
GROUP BY 
    Email 
HAVING 
    COUNT(DISTINCT Status) = 1 
;

该其他方法将用于任何数目的可能的工作Status es。

来源

2014-07-06 00:33:37

Select语句 - 只有当条件

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