Question

我有一张表，其中包含有关产品的常规信息。另一个表有定价信息，两个表都是1：n相关的。因此，每种产品可能（至少）有1到n的价格。

现在我需要在视图中与产品一起显示其中一些价格。另外，为了形成一些行，我必须添加或增加其中一些价格。

在我的第一次尝试中，我使用子查询进行输出和操作。哪个有效，但性能是...... meh ...... 我考虑过使用变量来设置定价值一次，然后重复使用它们。如果我能够一次设置2个或更多变量会更好。但是如何？

我的基本查询如下：

SELECT *
FROM (
SELECT ProductNr,
Description,
Year, ROW_NUMBER() OVER 
(PARTITION BY ProductNr ORDER BY Year DESC) RowRank
          FROM Products
     WHERE Year like '2014'
     AND Manager = 1
     )sub
    WHERE RowRank = 1

子查询基本上设置如下：

(SELECT Price FROM PricingInfo
WHERE Manager = 1
AND year = Products.Year
AND no = 1
AND ArticleNr = Products.ProductNr)

我尝试使用

DECLARE @price float
-- other ones...

SELECT *
FROM (
SELECT ProductNr,
Description,
@price = (SELECT colXX FROM PricingInfo
          WHERE Manager = 1
          AND year = products.Year
          AND row = 'Y'
          AND ArticleNr = products.ProductNr),
@price*1.2 as PriceWithTax
Year, ROW_NUMBER() OVER 
(PARTITION BY ProductNr ORDER BY Year DESC) RowRank
          FROM Products products
     WHERE Year like '2014'
     AND Manager = 1
     )sub
    WHERE RowRank = 1

这可以使用这样的构造吗？

编辑[21:09] - @MatBailie请求了一些例子：

ProductNr|Description|Year
      001| Teddy Bear|2012
      002|  Card game|2013
      003|       Book|2012
      003|       Book|2013

定价信息：

Category|No|Price|Notice| ID|Year
1       |1 |35,22|No Tax|001|2012
1       |2 |38,18|Tax   |001|2012
1       |3 |19,91|Bought|001|2012
1       |1 |19,91|Bought|002|2013

Answer 1

您可以尝试连接两个表，然后使用前一个表中连接表的值，而不是参数。

SELECT *
    FROM (    
    SELECT  P.ProductNr,
                P.Description,
                PInfo.Price,
                PInfo.Price*1.2 as PriceWithTax
                P.Year, 
                ROW_NUMBER() OVER (PARTITION BY P.ProductNr ORDER BY P.Year DESC) RowRank
        FROM Products P
        INNER JOIN (SELECT  ArticleNr, 
                            Year, 
                            colXX [Price]
                    FROM    PricingInfo
                    WHERE   Manager = 1
                            AND row = 'Y') PInfo
            ON P.ProductNr = PInfo.ArticleNr
            AND P.Year = PInfo.Year
        WHERE   Year = '2014'
                AND Manager = 1
    ) SUB
    WHERE SUB.RowRank = 1

希望它有所帮助！

Answer 2

SELECT *
FROM (
SELECT Products.ProductNr
      ,Products.[Description]
      ,P_Info.colXX     AS Price
      ,P_Info.colXX * 1.2  AS PriceWithTax
      ,P.[Year]
      ,ROW_NUMBER() OVER (PARTITION BY P_Info.ProductNr ORDER BY P_Info.[Year] DESC) RowRank
FROM Products P INNER JOIN PricingInfo P_Info
ON P.ProductNr = P_Info.ArticleNr
WHERE P.[Year] LIKE '2014' AND P_Info.[Year] LIKE '2014'
AND   P.Manager = 1  AND P_Info.Manager = 1
AND   P_Info.[ROW] = 'Y'
)Q
WHERE RowRank = 1

设置变量并将其用于查询中的输出

2 个答案: