LEAD Function in 2008

LEAD and LAG functions are new in SQL Server 2012 , This short Script could be used to get these values in Earlier versions also

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2016-06-28 (first published: 2016-05-18)

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I have this table in a SQL Server 2025 database:

CREATE TABLE [dbo].[CustomerOrder]
(
[OrderID] [int] NULL,
[CustomerID] [int] NULL,
[total] [money] NULL
) ON [PRIMARY]
GO

What is returned from this code? (answers are for the sum and then the count)

SELECT SUM(total) AS sum,
       COUNT(total) AS count
FROM dbo.CustomerOrder;