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我在 SQL Server 2008 之上使用 DotNetNuke。当以下代码返回 NULL 值时，我试图完全不返回任何内容。我不想要一个空行，我不想要“null”，我什么都不想要。这甚至可能吗？我尝试使用 COALESCE，但我要么遗漏了一些东西，要么它不是为此目的而设计的。

DECLARE @Category table (Category varchar(15), Deleted bit)

INSERT INTO @Category (Category, Deleted)
SELECT 'Benefits', 0
UNION ALL
SELECT 'UR', 0
UNION ALL
SELECT 'Events', 1

DECLARE @Staff Table (DNNUserID int, InternalStaff bit, 
Deleted bit, InactiveStaff bit)

INSERT INTO @Staff (DNNUserID, InternalStaff, Deleted, InactiveStaff)
SELECT '556', 1, 0, 0
UNION ALL
SELECT '423', 0, 0, 0
UNION ALL
SELECT '111', 1, 0, 1
UNION ALL
SELECT '222', 1, 1, 0

SELECT Category FROM @Category WHERE Deleted = 0
UNION ALL
SELECT CASE WHEN '111' IN 
    (SELECT DnnUserID FROM @Staff WHERE Deleted = 0 AND 
    InactiveStaff = 0 AND InternalStaff = 1) 
    THEN 'Internal Use Only' 
ELSE NULL END

变量表只是为了便于使用，这里有两个名称大致相同的真实表，我实际上必须使用它们。

我不能使用存储过程来执行这些操作，它必须是简单的选择语句或标量 UDF，以便我们使用的 Telerik 控件能够理解它。

我无法直接访问 DNN 的实际背景（因此我无法编辑任何 DNN 或 Telerik 的代码），只能访问服务器，并且只能通过主 DNN Web 界面将 select 语句添加到 Telerik 控件。

这个想法是，如果个人是我工作的公司的内部成员，我们会看到类别表中的主列表，以及下拉列表中的条目“仅限内部使用”。如果其他人使用它，例如，我们客户的一位员工，他们只会看到类别中的列表。

这可行吗？我目前正在尝试不使用某个功能，因为我无法在实时系统中对其进行测试（我今天在家工作，VPN 已关闭），但如果有必要，我可以并且会在我家进行测试使用上述 SQL 的数据库。

编辑

我可以在一个函数中大致使用它：

DECLARE @DNNUserID int = 111

DECLARE @Category table (Category varchar(15), Deleted bit)

INSERT INTO @Category (Category, Deleted)
SELECT 'Benefits', 0
UNION ALL
SELECT 'UR', 0
UNION ALL
SELECT 'Events', 1

DECLARE @Staff Table (DNNUserID int, InternalStaff bit, Deleted bit, 
InactiveStaff bit)

INSERT INTO @Staff (DNNUserID, InternalStaff, Deleted, InactiveStaff)
SELECT '556', 1, 0, 0
UNION ALL
SELECT '423', 0, 0, 0
UNION ALL
SELECT '111', 1, 0, 1
UNION ALL
SELECT '222', 1, 1, 0

IF @DNNUserID NOT IN (SELECT DnnUserID FROM @Staff WHERE Deleted = 0 
AND InactiveStaff = 0 AND InternalStaff = 1)
    BEGIN
        SELECT Category FROM @Category WHERE Deleted = 0
    END
IF @DNNUserID IN (SELECT DnnUserID FROM @Staff WHERE Deleted = 0 
AND InactiveStaff = 0 AND InternalStaff = 1)
    BEGIN
        SELECT Category FROM @Category WHERE Deleted = 0
        UNION ALL
        SELECT 'Internal Use Only'
    END

但！我宁愿找到一种方法来做到这一点而不必诉诸函数这可能吗？

4

2 回答 2

1 
DECLARE @Category table (Category varchar(15), Deleted bit)

INSERT INTO @Category (Category, Deleted)
SELECT 'Benefits', 0
UNION ALL
SELECT 'UR', 0
UNION ALL
SELECT 'Events', 1

DECLARE @Staff Table (DNNUserID int, InternalStaff bit, 
Deleted bit, InactiveStaff bit)

INSERT INTO @Staff (DNNUserID, InternalStaff, Deleted, InactiveStaff)
SELECT '556', 1, 0, 0
UNION ALL
SELECT '423', 0, 0, 0
UNION ALL
SELECT '111', 1, 0, 1
UNION ALL
SELECT '222', 1, 1, 0

SELECT Category FROM @Category WHERE Deleted = 0
UNION ALL
Select * from
(
SELECT CASE WHEN '111' IN 
    (SELECT DnnUserID FROM @Staff WHERE Deleted = 0 AND 
    InactiveStaff = 0 AND InternalStaff = 1) 
    THEN 'Internal Use Only' 
ELSE NULL END as ARow
) a 
where ARow is not null
于 2013-02-08T20:22:27.497 回答
1

这可能对你有用。EXISTS 听起来很适合您尝试做的事情。

DECLARE @Category table (Category varchar(15), Deleted bit)

INSERT INTO @Category (Category, Deleted)
SELECT 'Benefits', 0
UNION ALL
SELECT 'UR', 0
UNION ALL
SELECT 'Events', 1

DECLARE @Staff Table (DNNUserID int, InternalStaff bit, 
Deleted bit, InactiveStaff bit)

INSERT INTO @Staff (DNNUserID, InternalStaff, Deleted, InactiveStaff)
SELECT '556', 1, 0, 0
UNION ALL
SELECT '423', 0, 0, 0
UNION ALL
SELECT '111', 1, 0, 1
UNION ALL
SELECT '222', 1, 1, 0

SELECT Category FROM @Category WHERE Deleted = 0
UNION ALL

SELECT 'Internal Use Only'
WHERE EXISTS
    (
    SELECT 1 
    FROM @Staff
    WHERE Deleted = 0 AND 
      InactiveStaff = 0 AND 
      InternalStaff = 1 AND
      DNNUserID = 111
    )
于 2013-02-08T20:26:54.180 回答