Question

我正在阅读有关考试的培训套件-70-461查询SQL Server 2012.

第604页给出了一个例子，我正在测试它，但它不起作用......有什么建议吗？

示例：

IF OBJECT_ID(N'dbo.GetNums', N'IF') IS NOT NULL DROP FUNCTION  dbo.GetNums;
GO

CREATE FUNCTION dbo.GetNums (@low as bigint, @high as bigint) RETURNS TABLE
AS
RETURN
WITH
    L0 as (SELECT c from (VALUES(1), (1)) as D(c)),
    L1 as (SELECT 1 as c FROM L0 as A CROSS JOIN L0 AS B),
    L2 as (SELECT 1 as c FROM L1 as A CROSS JOIN L1 AS B),
    L3 as (SELECT 1 as c FROM L2 as A CROSS JOIN L2 AS B),
    L4 as (SELECT 1 as c FROM L3 as A CROSS JOIN L3 AS B),
    L5 as (SELECT 1 as c FROM L4 as A CROSS JOIN L4 AS B),
    Nums as (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) as rownum
            FROM L5)
SELECT @low + rownum - 1 as n
FROM Nums
ORDER BY rownum
OFFSET 0 ROWS 
FETCH FIRST @high - @low + 1 ROWS ONLY;
GO

错误讯息：

Msg 102，Level 15，State 1，Procedure GetNums，Line 17
  OFFSET＆＃39;附近的语法不正确   消息153，级别15，状态2，程序GetNums，第18行
  FETCH语句中选项FIRST的使用无效。

Answer 1

上面的代码在SQL Server 2008 R2中运行时会生成错误消息，但在SQL Server 2012中成功运行。

OFFSET和FETCH是new features in 2012。

用于数据操作任务的游标与基于集合的解决方案

1 个答案: