SQL服务器上 - 选择TOP 5行每个FK(SQL Server - SELECT TOP 5 r

我有以下查询，看起来最多的前5名匹配的商品搜索。每个产品与一个店铺相关

SELECT TOP 5 * FROM产品P，商店S其中p.ShopId = s.ShopId和p.ProductName LIKE '％圣诞％'

我需要扩展这一点，以便它返回我在每个店的TOP 5 的产品 。

任何人都可以让我知道了如何查询可以修改实现这一目标？ -即选择在每个店（而非其显示，前5个产品匹配的“％圣诞％”在所有店的电流）的TOP 5的产品匹配的“圣诞％％”。

Answer 1:

你实际上缺少一个ORDER BY，使TOP有意义的，或基于ROW_NUMBER任何解决方案，它需要一个ORDER BY。

SELECT
    *
FROM
    Shops s 
CROSS APPLY (
    SELECT TOP 5
        *
    FROM
        Products p
    WHERE
        p.ShopId = s.ShopId AND p.ProductName LIKE '%christmas%'
    ORDER BY --added on edit
        ???
) X

Answer 2:

试试这个：

select * from (
    select *, rn = row_number() over (partition by s.ShopId order by p.ProductName)
    from Products p, Shops s 
    where p.ShopId = s.ShopId AND p.ProductName LIKE '%christmas%'
) a where a.rn <= 5

Answer 3:

试试这个

SELECT DISTINCT 
        A.Product_Group_code
        ,B.Sub_Product_Group_code
        ,A.Product_code
        ,A.Product_name
FROM dbo.A A
    LEFT JOIN dbo.B B
        ON A.Product_code = B.Product_code
WHERE  B.Product_code IN
                (
                    SELECT TOP 5 E.Product_code
                    FROM dbo.A D
                        LEFT JOIN dbo.B E
                            ON D.Product_code = E.Product_code
                    WHERE E.Sub_Product_Group_code = B.Sub_Product_Group_code
                )
        AND B.Sub_Product_Group_code IS NOT NULL
ORDER BY B.Sub_Product_Group_code,A.Product_name

Answer 4:

这里是一个很好的解决方案我刚刚发现。

选择TOP N行的每个组阿尼·罗兰，2008年3月13日，

有每个类别多行，而只以价格只能选择每个类别的前两名（2）行的愿望。例如，从以下数据：

RowID    Category    ID  Description     Price
1    Pot     A1  Small Saucepan  21.50
2    Pot     A2  1 Qt Saucepan   29.95
3    Pot     A3  1.5 Qt Saucepan     33.95
4    Pot     A4  Double Boiler   39.50
5    Pot     A5  Stewpot     49.50
6    Pot     A6  Pressure Cooker     79.95
7    Pan     B1  8" Pie  6.95
8    Pan     B2  8" Sq Cake  7.50
9    Pan     B3  Bundt Cake  12.50
10   Pan     B4  9x12 Brownie    7.95
11   Bowl    C1  Lg Mixing   27.50
12   Bowl    C2  Sm Mixing   17.50
13   Tools   T1  14" Spatula     9.95

所期望的输出是：

RowID    Category    ID  Description     Price
11   Bowl    C1  Lg Mixing   27.50
12   Bowl    C2  Sm Mixing   17.50
9    Pan     B3  Bundt Cake  12.50
10   Pan     B4  9x12 Brownie    7.95
6    Pot     A6  Pressure Cooker     79.95
5    Pot     A5  Stewpot     49.50
13   Tools   T1  14" Spatula     9.95

有几种方法来完成所需的输出。此演示提供了对SQL Server 2005 / SQL Server 2008中，然后用于SQL Server 2000一个解决方案的解决方案。

创建两种解决方案示例数据

-- Suppress data loading messages
SET NOCOUNT ON

-- Create Sample Data using a Table Varable
DECLARE @MyTable table
   (  RowID         int   IDENTITY, 
      Category      varchar(5),
      [ID]          varchar(5),
      [Description] varchar(25),
      Price         decimal(10,2)
   )

-- Load Sample Data

INSERT INTO @MyTable VALUES ( 'Pot', 'A1', 'Small Saucepan', 21.50 )
INSERT INTO @MyTable VALUES ( 'Pot', 'A2', '1 Qt Saucepan', 29.95 )
INSERT INTO @MyTable VALUES ( 'Pot', 'A3', '1.5 Qt Saucepan', 33.95 )
INSERT INTO @MyTable VALUES ( 'Pot', 'A4', 'Double Boiler', 39.50 )
INSERT INTO @MyTable VALUES ( 'Pot', 'A5', 'Stewpot', 49.50 )
INSERT INTO @MyTable VALUES ( 'Pot', 'A6', 'Pressure Cooker', 79.95 )
INSERT INTO @MyTable VALUES ( 'Pan', 'B1', '8"" Pie', 6.95 )
INSERT INTO @MyTable VALUES ( 'Pan', 'B2', '8"" Sq Cake', 7.50 )
INSERT INTO @MyTable VALUES ( 'Pan', 'B3', 'Bundt Cake', 12.50 )
INSERT INTO @MyTable VALUES ( 'Pan', 'B4', '9x12 Brownie', 7.95 )
INSERT INTO @MyTable VALUES ( 'Bowl', 'C1', 'Lg Mixing', 27.50 )
INSERT INTO @MyTable VALUES ( 'Bowl', 'C2', 'Sm Mixing', 17.50 )
INSERT INTO @MyTable VALUES ( 'Tools', 'T1', '14"" Spatula', 9.95 )
Return to Top

的SQL Server 2005 / SQL Server 2008中的解决方案

--Query to Retrieve Desired Data
SELECT
   RowID,
   Category,
   [ID],
   [Description],
   Price
FROM (SELECT
         ROW_NUMBER() OVER ( PARTITION BY Category ORDER BY Price DESC ) AS 'RowNumber',
         RowID,
         Category,
         [ID],
         [Description],
         Price
      FROM @MyTable
      ) dt
WHERE RowNumber <= 2

-- Results
RowID Category  ID Description     Price
11    Bowl      C1 Lg Mixing       27.50
12    Bowl      C2 Sm Mixing       17.50
9     Pan       B3 Bundt Cake      12.50
10    Pan       B4 9x12 Brownie    7.95
6     Pot       A6 Pressure Cooker 79.95
5     Pot       A5 Stewpot         49.50
13    Tools     T1 14" Spatula     9.95
Return to Top

的SQL Server 2005 / SQL服务器使用CTE 2008解决方案（添加人：雅各塞巴斯蒂安）

-- Define a CTE with the name "dt" 
;WITH dt AS (
     SELECT
         ROW_NUMBER() OVER ( PARTITION BY Category ORDER BY Price DESC ) AS 'RowNumber',
         RowID,
         Category,
         [ID],
         [Description],
         Price
      FROM @MyTable
)
-- and select the data from the CTE
SELECT
   RowID,
   Category,
   [ID],
   [Description],
   Price
FROM dt
WHERE RowNumber <= 2

-- Results
RowID Category  ID Description     Price
11    Bowl      C1 Lg Mixing       27.50
12    Bowl      C2 Sm Mixing       17.50
9     Pan       B3 Bundt Cake      12.50
10    Pan       B4 9x12 Brownie    7.95
6     Pot       A6 Pressure Cooker 79.95
5     Pot       A5 Stewpot         49.50
13    Tools     T1 14" Spatula     9.95
Return to Top

SQL 2000解决方案

--Query to Retrieve Desired Data
SELECT DISTINCT
   RowID,
   Category,
   [ID],
   [Description],
   Price
FROM @MyTable t1
WHERE RowID IN (SELECT TOP 2
                   RowID
                FROM @MyTable t2
                WHERE t2.Category = t1.Category
                ORDER BY Price DESC
               )
ORDER BY 
   Category,
   Price DESC

-- Results
RowID Category  ID Description     Price
11    Bowl      C1 Lg Mixing       27.50
12    Bowl      C2 Sm Mixing       17.50
9     Pan       B3 Bundt Cake      12.50
10    Pan       B4 9x12 Brownie    7.95
6     Pot       A6 Pressure Cooker 79.95
5     Pot       A5 Stewpot         49.50
13    Tools     T1 14" Spatula     9.95

来源：选择TOP N行的每个组