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下面的脚本一切正常，直到我尝试添加带有 SELECT 子句的 Case 语句 我已经这样做以使用正确的日期自动填充表，可以让我知道我做错了什么吗？

DECLARE @PitchType_Skey INT
DECLARE @Site_Skey INT
DECLARE @Capacity INT
DECLARE @StartDate DATE
DECLARE @EndDate DATE

SET @PitchType_Skey = 1
SET @Site_Skey = 1
SET @Capacity = 0

WHILE (@Site_Skey < 127)

BEGIN
    IF @PitchType_Skey = 8

BEGIN

SET @PitchType_Skey = 1
SET @Site_Skey = @Site_Skey + 1

END

IF (@Site_Skey < 127)

BEGIN

Set @Capacity = (SELECT SiteWeighting From Site Where Site_Skey = @Site_Skey)
Set @Capacity = @Capacity * (SELECT PitchTypeWeighting From PitchType  Where PitchType_Skey = @PitchType_Skey)
Set @Capacity = @Capacity * ((10*(100+((RAND()*40)-20)))*0.01)

     INSERT INTO Capacity 
     SELECT
     CASE @StartDate
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 1 THEN 01/05/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 2 THEN 01/04/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 3 THEN 01/04/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 4 THEN 01/01/2010) ELSE,

     CASE @EndDate
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 1 THEN 30/09/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 2 THEN 01/11/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 3 THEN 01/11/2010) ELSE,
     WHEN (SELECT SiteWeighting FROM Site WHERE SiteWeighting = 4 THEN 01/12/2010) ELSE,

      round(@Capacity,0) as Capacity,
      @PitchType_Skey, @Site_Skey

END
  SET @PitchType_Skey = @PitchType_Skey + 1

END
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1 回答 1

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好吧，你的括号放错了地方。 THEN是 case 语句的一部分，但您在子查询中拥有它。您也只需要ELSE每个案例陈述一个。

如果不了解更多关于您的表的信息，很难知道是否还有更多错误，但语法正确的 case 语句看起来像这样：

CASE @StartDate
  WHEN (SELECT SiteWeighting FROM Site WHERE Site_SKey=@Site_SKey)=1 THEN '01/05/2010'
  WHEN (SELECT SiteWeighting FROM Site WHERE Site_SKey=@Site_SKey)=2 THEN '01/04/2010'
  ELSE NULL 
END

但是，我强烈建议您不要为此使用 case 语句。相反，请使用其他东西，例如带有开始和结束日期的查找表，您可以基于SiteWeighting. 它会让你的生活轻松很多。

于 2013-02-12T15:50:10.813 回答