Case语句总是跳到存储过程中的ELSE语句。

Question

在插入sql存储过程期间，我试图使用CASE语句，如下所示：

INSERT INTO [dbo].[OfferPrice]
            (OfferId,Price,DefaultPrice,SalePrice,
             SaleFromDate,SaleToDate)
SELECT tvp.OfferId   AS OfferId,
       CASE
         WHEN @Price IS NOT NULL THEN @Price
         WHEN @Price IS NULL
              AND tvp.SalePrice IS NOT NULL
              AND Getutcdate() >= tvp.SaleFromDate
              AND Getutcdate() < tvp.SaleToDate THEN tvp.SalePrice
         WHEN @Price IS NULL
              AND tvp.SalePrice IS NULL THEN tvp.DefaultPrice
         ELSE 0
       END AS Price,
       tvp.DefaultPrice AS DefaultPrice,
       tvp.SalePrice AS SalePrice,
       tvp.SaleFromDate AS SaleFromDate,
       tvp.SaleToDate AS SaleToDate
FROM   @OfferPriceTVP tvp
       LEFT JOIN [dbo].OfferPrice dop
              ON dop.OfferId = tvp.OfferId
WHERE  dop.OfferId IS NULL 

问题是，即使前面的语句是正确的，大小写也总是跳到别处。我做错了什么？

编辑：

这是@OfferPriceTVP：

CREATE TYPE [dbo].[TVP_OfferPrice] AS TABLE
(
    OfferId INT NOT NULL PRIMARY KEY, CountryId INT NOT NULL, VatRateId INT, DefaultPrice decimal(16, 4), SalePrice decimal(16, 4),
    SaleFromDate datetime, SaleToDate datetime
);

在这里，我现在想要做的插入(即使没有日期，它应该设定默认价格，对吗？)：

DECLARE @OfferPriceTVP AS [dbo].[TVP_OfferPrice]
INSERT INTO @OfferPriceTVP (OfferId,CountryId,VatRateId,DefaultPrice,SalePrice,SaleFromDate,SaleToDate)
VALUES (10006805,2,1,1,1,NULL,NULL),
(10006806,1,1,2,1,NULL,NULL),
(10006807,1,1,3,1,NULL,NULL),
(10006808,1,1,4,1,NULL,NULL),
(10006809,1,1,5,1,NULL,NULL),
(10006810,1,1,6,2,NULL,NULL);
EXEC [dbo].[TVP_OfferPrice] @OfferPriceTVP;
GO

Answer 1

将其与NULL进行比较总是错误的。您的表中没有销售日期。销售周期检查

Getutcdate() >= tvp.SaleFromDate AND Getutcdate() < tvp.SaleToDate

永远都会失败。

这意味着，如果@Price是NULL，而SalePrice不是，那么只有ELSE语句是有效的。

Answer 2

我认为，也许，如果没有销售日期，你的意图是要么采取销售价格(如果有)或默认价格。

如果是这样的话，那么只需在第三个WHEN中省略WHEN签入并使用COALESCE

   CASE
     WHEN @Price IS NOT NULL THEN @Price
     WHEN @Price IS NULL
          AND tvp.SalePrice IS NOT NULL
          AND Getutcdate() >= tvp.SaleFromDate
          AND Getutcdate() < tvp.SaleToDate THEN tvp.SalePrice
     WHEN @Price IS NULL
          THEN COALESCE(tvp.SalePrice,tvp.DefaultPrice)
     ELSE 0
   END AS Price