获取结果总数和分页是两个不同的操作.为了这个示例，我们假设您要处理的查询是

Getting the total number of results and paginating are two different operations. For the sake of this example, let's assume that the query you're dealing with is

SELECT * FROM Orders WHERE OrderDate >= '1980-01-01' ORDER BY OrderDate

在这种情况下，您可以使用以下方法确定结果总数:

In this case, you would determine the total number of results using:

SELECT COUNT(*) FROM Orders WHERE OrderDate >= '1980-01-01'

...这似乎效率低下，但假设所有索引等均已正确设置，实际上却表现不错.

...which may seem inefficient, but is actually pretty performant, assuming all indexes etc. are properly set up.

接下来，要以分页的方式获取实际结果，以下查询将是最有效的:

Next, to get actual results back in a paged fashion, the following query would be most efficient:

SELECT  *
FROM    ( SELECT    ROW_NUMBER() OVER ( ORDER BY OrderDate ) AS RowNum, *
          FROM      Orders
          WHERE     OrderDate >= '1980-01-01'
        ) AS RowConstrainedResult
WHERE   RowNum >= 1
    AND RowNum < 20
ORDER BY RowNum

这将返回原始查询的1-19行.这里最酷的事情是，特别是对于Web应用程序，您无需保留任何状态，除了要返回的行号.

This will return rows 1-19 of the original query. The cool thing here, especially for web apps, is that you don't have to keep any state, except the row numbers to be returned.