Question

我有以下表格：

**Product**  
ProdID  int  
ProdOwner (nvarchar)  
Views int  


**Reviews**  
RevID int  
RevDate datetime  
ProdOwner  
ProdID

如果我将像“Jake Bill”（ProdOwner）这样的字符串传递给我的storedproc，我需要获得以下输出

Total Products Owned: 27  
Total Product Views: 78967  
Total Reviews Received on All Products: 89

如何编写此查询？我正在使用SQL 2008.这就是我所做的：

CREATE PROCEDURE [dbo].[GetProdCountByOwner]  
(  
   @ProdOwnerName    nvarchar(256)
)  
AS  
SET NOCOUNT ON  

SELECT COUNT(p.ProdID),  Count(p.Views), Count(r.RevID)  FROM Product p join Review r
on p.ProdID = r.ProdID
WHERE p.ProdOwner = @ProdOwnerName
GO

Answer 1

SELECT COUNT(*) AS [Total Products Owned],
    SUM(p.Views) AS [Total Product Views],
    (SELECT COUNT(*)
      FROM Product p JOIN Reviews r ON p.ProdID = r.ProdID
      WHERE p.ProdOwner = 'Jake Bill'
    ) AS [Total Reviews Received on All Products]
FROM Product p
WHERE p.ProdOwner = 'Jake Bill'

Answer 2

假设你得到的结果太高（也就是说，所有3个人的得分最高）

SELECT
    COUNT(DISTINCT p.ProdID),  SUM(p.Views), Count(DISTINCT r.RevID)
FROM
    Product p LEFT join Review r on p.ProdID = r.ProdID
WHERE
    p.ProdOwner = @ProdOwnerName

对多列进行计数

2 个答案: