更正此更新过程的 sql 语法

Question

我有三个table：

带有 LandingId、ProductId 和 UnitPrice 字段的 LandingDetails

带有 LandingId 和 LandingDate 字段的 LandingHeaders

具有 ProductId 和 CostPrice 字段的产品

我希望根据介于两个日期之间的 landingHeaders 中的着陆日期，从 Products 中的成本价格更新 LandingDetails UnitPrice。

第一次尝试时，我想到了以下内容，这可能符合目标的概念，但显然错过了 table 个连接。

    CREATE PROCEDURE dbo.UpdateAndPriceLandings
@StartDate DATE,
@EndDate  DATE
  AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

UPDATE LandingDetails
  SET UnitPrice = (SELECT p.CostPrice FROM Products p WHERE p.ProductId = LandingDetails.ProductId AND 
  dbo.LandingHeaders.LandingId = LandingId AND dbo.LandingHeaders.LandingDate1 BETWEEN @StartDate AND @EndDate)
GO

版本二如下，但我怀疑连接不正确。

CREATE PROCEDURE dbo.UpdateAndPriceLandings
@StartDate DATE,
@EndDate  DATE
  AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

UPDATE dbo.LandingDetails
  SET UnitPrice = (SELECT p.CostPrice FROM     dbo.LandingDetails ld INNER JOIN
                         dbo.LandingHeaders lh ON ld.LandingId = lh.LandingId INNER JOIN
                         dbo.Products P ON ld.ProductId = p.ProductId
 WHERE 

  ld.LandingId = lh.LandingId AND lh.LandingDate BETWEEN @StartDate AND @EndDate)

GO

任何人都可以指出我怀疑是我的愚蠢语法错误吗？

Answer 1

您在第二个 SP 中的查询应如下所示：

UPDATE
    dbo.LandingDetails
SET 
    UnitPrice=p.CostPrice
FROM
    dbo.LandingDetails ld
    INNER JOIN dbo.LandingHeaders lh ON 
        lh.LandingId=ld.LandingId
    INNER JOIN dbo.Products P ON 
        P.ProductId=ld.ProductId
 WHERE 
    lh.LandingDate BETWEEN @StartDate AND @EndDate

更正此更新过程的 sql 语法

Correct sql syntax for this Update Procedure

sql

sql-server-2014-express