Question

我有一个查询，需要在WHERE子句中添加条件。条件是，如果companyID在特定列表内，则仅显示具有LocationTypeID的用户，否则显示所有用户。反正有实现这一目标的方法吗？

SELECT 
    UserID
FROM [Account].[User] AS [User]
INNER JOIN [Account].[Location] as [Location]
    ON [Location].[LocationID] = [User].[LocationID]

我正在尝试在where子句中添加条件，但不确定如何做。

WHERE
CASE WHEN Location.CompanyID IN (123, 344, 444, 565)
THEN 'AND Location.LocationTypeID IS NOT NULL'

Answer 1

使用下面的条件

SELECT 
    UserID
FROM [Account].[User] AS [User]
INNER JOIN [Account].[Location] as [Location]
    ON [Location].[LocationID] = [User].[LocationID] 
    where        
    (
     Location.CompanyID IN (123, 344, 444, 565)
     AND Location.LocationTypeID IS NOT NULL
    ) 
     OR 
     (
      Location.CompanyID not IN (123, 344, 444, 565)          
     )

Answer 2

当简单的逻辑组合将起作用时，人们似乎总是想使用setTimeout：

CASE

请注意，我已经颠倒了第一个条件，因此只要第一个条件为假，我们只需要第二个条件为真即可。当然，它们可能都是正确的，但这无关紧要。

Answer 3

尝试以下查询-：

SELECT 
    UserID
FROM [Account].[User] AS [User]
INNER JOIN [Account].[Location] as [Location]
    ON [Location].[LocationID] = [User].[LocationID]
WHERE
Location.CompanyID IN (123, 344, 444, 565)
AND Location.LocationTypeID IS NOT NULL

SQL Server 2014

SQL Server中WHERE子句中的大小写/存在

3 个答案: