Question

我在要查找的表格中有特定信息，此查询将显示：

SELECT StringValue FROM ClientSettings
WHERE Setting like 'CompanyDomain'
OR Setting like 'CompanyActivityEmail'
OR Setting like 'CompanySupportPhone'
OR Setting like 'CompanyName'

返回以下日期：

StringValue
MyCompanyName
MyCompanyName@email.com
www.mycompanydomain.com
801-555-1212

我现在尝试将这些设置为变量，而不必制作4个单独的select语句。

这就是我所拥有的，但它并不像我想要的那样工作：

DECLARE @CompanyName VARCHAR(100)
DECLARE @CompanyDomain VARCHAR(100)
SELECT @CompanyName = StringValue, @CompanyDomain = StringValue FROM ClientSettings
WHERE Setting like 'CompanyName'
OR Setting like 'CompanyDomain'

SELECT @CompanyName
SELECT @CompanyDomain

我很好奇我是否可以尝试一下？

Answer 1

我认为问题是你应该只为每一行分配一个值，但不能同时覆盖其他变量。 CASE语句可以让你这样做：

DECLARE @CompanyName VARCHAR(100)
DECLARE @CompanyDomain VARCHAR(100)

SELECT 
    @CompanyName = CASE WHEN Setting = 'CompanyName' 
        THEN StringValue ELSE @CompanyName END, 
    @CompanyDomain = CASE WHEN Setting = 'CompanyDomain' 
        THEN StringValue ELSE @CompanyDomain END
FROM ClientSettings
WHERE Setting like 'CompanyName'
OR Setting like 'CompanyDomain'

SELECT @CompanyName
SELECT @CompanyDomain

Answer 2

您可以使用PIVOT执行此操作，但它有点hacky，因为它需要使用聚合来工作

DECLARE @CompanyName VARCHAR(100) 
DECLARE @CompanyDomain VARCHAR(100) 

SELECT @CompanyName = [CompanyName], 
       @CompanyDomain = [CompanyDomain] 
FROM   (SELECT setting, 
               stringvalue 
        FROM   clientsettings 
        WHERE  setting LIKE 'CompanyName' 
                OR setting LIKE 'CompanyDomain') AS sourcetable PIVOT ( MAX( 
       stringvalue 
       ) FOR setting IN ([CompanyName], [CompanyDomain]) ) AS pivottable

SELECT @CompanyName, 
       @CompanyDomain

Working demo

Answer 3

SELECT setting, StringValue 
FROM ClientSettings
WHERE Setting in ('CompanyDomain'
                  ,'CompanyActivityEmail'
                  ,'CompanySupportPhone'
                  ,'CompanyName')

然后循环结果并分配变量。

Answer 4

作为一种替代方法，您可以创建一个名为company_settings的表，其中Setting列的值为'CompanyDomain'，'CompanyActivityEmail'等。< / p>

然后你可以这样做：

SELECT StringValue FROM ClientSettings
WHERE Setting is in (select Setting from company_settings);

或简单地说：

SELECT StringValue 
FROM ClientSettings a
JOIN company_settings b
ON (a.Setting=b.Setting);

我试图用sql做什么甚至可能？

4 个答案: