存储过程中的 Case 语句总是跳到 ELSE

Case statement always skipping to ELSE in stored procedure

我正在尝试在 sql 存储过程中插入时使用 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 CASE 总是跳到 ELSE,即使前面的陈述是正确的。我做错了什么?

编辑:

我是@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
);

这里是我现在尝试做的插入(即使没有日期它应该将价格设置为默认价格对吗?):

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

与 NULL 的比较总是错误的。您的 table 不包含销售日期。销售期检查

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

总是会失败。

这意味着如果 @Price 为 NULL 而 SalePrice 不是,则只有 ELSE 语句有效。

我认为,如果没有销售日期,您的意图可能是采用销售价格(如果有)或默认价格。

如果是这种情况,则只需省略第三个 WHEN 中的 SalePrice IS NULL 检查并使用 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