SQL Server 2012 OFFSET/FETCH NEXT分页示例

原文：http://beyondrelational.com/modules/29/presentations/483/scripts/12983/sql-server-2012-server-side-paging-demo-using-offsetfetch-next.aspx?utm_source=brnewsletter&utm_medium=email&utm_campaign=2012Apr

SQL Server 2005 引入了 ROW_NUMBER()来提供一种容易的分页方式。 SQL Server 2012 添加了另外一种更简单高效的分页方式。

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   /*
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   执行脚本去创建这个表并插入数据。
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   */
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   IF OBJECT_ID('Customers','U') IS NOT NULL
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   DROP TABLE Customers
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   CREATE TABLE Customers (
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   CustomerID INT,
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   CustomerNumber CHAR(4),
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    CustomerName VARCHAR(50),
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    CustomerCity VARCHAR(20) )
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    GO
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    INSERT INTO Customers (
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    CustomerID, CustomerNumber, CustomerName, CustomerCity
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    )
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    SELECT
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    Number,
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    REPLACE(STR(Number, 4), ' ', '0'),
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    'Customer ' + STR(number,6),
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    CHAR(65 + (number % 26)) + '-City'
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    FROM master..spt_values WHERE type = 'p'
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    AND number BETWEEN 0 AND 999
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    /*
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    用ROW_NUMBER()的分页示例- SQL Server 2005/2008 版本。
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    */
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    DECLARE @page INT, @size INT
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    SELECT @page = 3, @size = 10
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    ;WITH cte AS (
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    SELECT TOP (@page * @size)
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    CustomerID,
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    CustomerName,
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    CustomerCity,
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    ROW_NUMBER() OVER(ORDER BY CustomerName ) AS Seq,
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    COUNT(*) OVER(PARTITION BY '') AS Total
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    FROM Customers
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    WHERE CustomerCity IN ('A-City','B-City')
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    ORDER BY CustomerName ASC
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    )
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    SELECT
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    *
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    FROM cte
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    WHERE seq BETWEEN (@page - 1 ) * @size + 1 AND @page * @size
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    ORDER BY seq
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    /*
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    SQL Server 2012中新添加的分页示例
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    */
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    DECLARE @page INT, @size INT
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    SELECT @page = 3, @size = 10
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    SELECT
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    *,
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    COUNT(*) OVER(PARTITION BY '') AS Total
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    FROM Customers
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    WHERE CustomerCity IN ('A-City','B-City')
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    ORDER BY CustomerID
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    OFFSET (@page -1) * @size ROWS
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    FETCH NEXT @size ROWS ONLY;
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    /*
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    同时执行这两个版本，打开执行计划，你可以注意到在这个例子中显著的性能差异。
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    */