如何在 SQL Server 中同时使用 PIVOT 和 JOIN？答案

【问题标题】：How to use PIVOT and JOIN together in SQL Server?如何在 SQL Server 中同时使用 PIVOT 和 JOIN？
【发布时间】：2015-07-29 23:05:51
【问题描述】：

这是表'VendorItemPricing'。

ItemID  VendorName     VendorPrice    
122     HP             215.13
122     IBM            264.41
122     Microsoft      257.65

我使用此查询将行设为列。

Select ItemID,
[HP] As HPPrice ,
[Apple] As ApplePrice,
[Microsoft] As MicrosoftPrice,
[IBM] As IBMPrice from (
select ItemID,VendorName,VendorPrice from VendorItemPricing where ItemID = 122)A
PIVOT(MAX(VendorPrice) FOR VendorName IN ([HP],[Apple],Microsoft,IBM))P

这就是我预期的输出。

ItemID  HPPrice  ApplePrice  MicrosoftPrice  IBMPrice
122     215.13   NULL        257.65          264.41

这是我的表“MasterItems”，我使用此查询得到以下结果。

select ItemID, ItemPartNumber, ItemDescription, CreatedDate, InitialPrice from MasterItems where ItemID = 122

大概就是这个结果。

ItemID  ItemPartNumber  ItemDescription  CreatedDate                InitialPrice
122     AB246VB         Volt Fuser Kit   2015-05-15 17:17:32.940    215.14

是否可以同时加入两个结果并获得如下结果？

ItemID  ItemPartNumber  ItemDescription  CreatedDate                InitialPrice    HPPrice    ApplePrice   MicrosoftPrice   IBMPrice
122     AB246VB         Volt Fuser Kit   2015-05-15 17:17:32.940    215.14          215.13     NULL         257.65           264.41

【问题讨论】：

标签： sql-server join sql-server-2012 pivot-table

【解决方案1】：

您可以简单地在PIVOT的源表中执行连接：

Select ItemID, ItemPartNumber, ItemDescription, CreatedDate, InitialPrice,
       [HP] As HPPrice, 
       [Apple] As ApplePrice, 
       [Microsoft] As MicrosoftPrice,
       [IBM] As IBMPrice 
from (
   select v.ItemID, VendorName, VendorPrice, 
          ItemPartNumber, ItemDescription, CreatedDate, InitialPrice
   from VendorItemPricing as v 
   left join MasterItems as m on v.ItemID = m.ItemID
   where v.ItemID = 122)A
PIVOT(
   MAX(VendorPrice) 
   FOR VendorName IN ([HP],[Apple],Microsoft,IBM)
)P

SQL Fiddle Demo

【讨论】：

【解决方案2】：

SELECT M.*, [HP] As HPPrice, 
       [Apple] As ApplePrice, 
       [Microsoft] As MicrosoftPrice,
       [IBM] As IBMPrice
FROM MasterItems M
JOIN (
    select ItemID,VendorName,VendorPrice from VendorItemPricing where ItemID = 122
)A
PIVOT(MAX(VendorPrice) FOR VendorName IN ([HP],[Apple],Microsoft,IBM)) P
ON M.ItemId = P.ItemId

您可以根据自己的需求将 JOIN 调整为 LEFT JOIN。

【讨论】：

【解决方案3】：

假设您所说的使用 CTE 与数据透视集结果连接的主表使用示例数据

declare  @table  table (Itemid Int,Vendorname varchar(10),VendorPrice DECIMAL(18,2))
insert into @table (Itemid,Vendorname,VendorPrice)
values (122,'HP',125.66),
(122,'microsoft',134.00),
(122,'IBM',124.90)

Declare @master table (Itemid int,Partnumber Varchar(10),Description varchar(20),Created datetime,InitialPrice decimal(18,2))
insert into @master (Itemid,Partnumber,Description,Created,InitialPrice)values (122,'AB246VB','Volt Fuser Kit',GETDATE(),215.14)

;with cte as (
Select Itemid,[HP] As HPPrice ,
[Apple] As ApplePrice,
[microsoft] As microsoftPrice,
[IBM] As IBMPrice from (
select Itemid,Vendorname,VendorPrice from @table where ItemID = 122)A
PIVOT(MAX(VendorPrice) FOR Vendorname IN ([HP],[Apple],[microsoft],[IBM]))P)
select t.Itemid,
t.Partnumber,
t.Description,
t.Created,
t.InitialPrice,
c.HPPrice,c.ApplePrice,
c.IBMPrice,
c.microsoftPrice from  @master t,cte c where t.ItemID = 122

【讨论】：