SQL Server的ORDER BY子句用一个参数值

Question

我已经写下面的存储过程。如果我不使用IF by子句ELSE块秩序工作正常，但我需要的，如果其他人使用来构建我的select语句。由是为了不与其他IF块工作。你能告诉我什么我做错了吗？ 先谢谢了！

ALTER PROCEDURE [dbo].[GetLookupItem] 

-- #description Gets LookupItem 
-- #tables   Subscriber.Reference.LookupItem,Subscriber.Reference.LookupText,Subscriber.Reference.LookupType
-- #parameter:   @LookupTypeId       This parameter defines a type of lookup
-- #parameter:   @LookupTextAbbreviationId            This Variable decides to tie Lookup Text to Abbreviation or Full Text. Most of the cases Full text will be used.
-- #parameter:   @LanguageCode     To show the Lookup Text in this Language

 @LookupTypeId int,
 @LookupTextAbbreviationId int ,
 @LanguageCode varchar(5)


AS

BEGIN

 SET NOCOUNT ON;
 DECLARE @MonthType int
 SET @MonthType = (SELECT Id FROM Subscriber.Reference.LookupType WHERE Name = 'Months')

 IF  @LookupTextAbbreviationId IS NULL
  BEGIN
   SELECT RLI.Id,RLT.Value
   FROM Subscriber.Reference.LookupItem RLI
   INNER JOIN Subscriber.Reference.LookupText RLT
   ON RLI.LookupTextId = RLT.Id AND RLT.LanguageCode = @LanguageCode AND RLI.LookupTextAbbreviationId IS NULL   -- LookupTextAbbreviationId will be null for full text records in Subscriber.Reference.LookupItem
   WHERE RLI.LookupTypeId = @LookupTypeId 
  END
 ELSE

  SELECT RLI.Id,RLT.Value
  FROM Subscriber.Reference.LookupItem RLI
  INNER JOIN Subscriber.Reference.LookupText RLT
  ON RLI.LookupTextAbbreviationId = RLT.Id AND RLT.LanguageCode = @LanguageCode
  WHERE RLI.LookupTypeId = @LookupTypeId


        ORDER BY                -- Order by will change for only Months by ID
        CASE  @LookupTypeId 
   WHEN @MonthType THEN RLT.Id 
   END,
  CASE 
   WHEN @LookupTypeId <> @MonthType THEN RLT.Value 
  END

 IF (@@ERROR <> 0)
  RETURN 1
 ELSE
  RETURN 0  

END

Answer 1

你想为了通过RLT.Id时@LookupTypeId等于@MonthType和RLT.Value否则？然后情况应该是这样的：

ORDER BY
CASE @LookupTypeId 
   WHEN @MonthType THEN RLT.Id
   ELSE RLT.Value
END

不过，如果RLT.Id和RLT.Value两者不相同的类型，你会得到一个转换错误。如果RLT.Id是int和RLT.Value为varchar，那么你可以的情况下更改为：

ORDER BY
CASE @LookupTypeId 
   WHEN @MonthType THEN STR(RLT.Id)
   ELSE RLT.Value
END

Answer 2

我觉得你的ORDER BY子句语法混合起来 - 这是否运行的查询？或没有给出一个语法错误？

这是你在寻找什么？

ORDER BY  -- Order by will change for only Months by ID 
  CASE  @LookupTypeId  
    WHEN @MonthType THEN RLT.Id  
    ELSE RLT.Value  
  END