现在在看一本叫做《ASP.NET2.0电子商务开发实战》的数，书写的不错，里面有个存储过程，是用来分页显示数据，不知道他的性能怎么样，请各位高手看看

CREATE PROCEDURE GetProductsOnCatalogPromotion
(@DescriptionLength INT,
@PageNumber INT,
@ProductsPerPage INT,
@HowManyProducts INT OUTPUT)
AS

-- declare a new TABLE variable
DECLARE @Products TABLE
(RowNumber INT,
 ProductID INT,
 Name VARCHAR(50),
 Description VARCHAR(5000),
 Price MONEY,
 Image1FileName VARCHAR(50),
 Image2FileName VARCHAR(50),
 OnDepartmentPromotion BIT,
 OnCatalogPromotion BIT)

-- populate the table variable with the complete list of products
INSERT INTO @Products
SELECT ROW_NUMBER() OVER (ORDER BY Product.ProductID),
       ProductID, Name,
       SUBSTRING(Description, 1, @DescriptionLength) + '...' AS Description,
       Price, Image1FileName, Image2FileName, OnDepartmentPromotion, OnCatalogPromotion
FROM Product
WHERE OnCatalogPromotion = 1

-- return the total number of products using an OUTPUT variable
SELECT @HowManyProducts = COUNT(ProductID) FROM @Products

-- extract the requested page of products
SELECT ProductID, Name, Description, Price, Image1FileName,
       Image2FileName, OnDepartmentPromotion, OnCatalogPromotion
FROM @Products
WHERE RowNumber > (@PageNumber - 1) * @ProductsPerPage
  AND RowNumber <= @PageNumber * @ProductsPerPage

GO