The following example demonstrates the LAG function. The query uses the LAG function to return the difference in sales quotas for a specific employee over previous calendar quarters. Notice that ...

Learn how to use the LEAD and LAG functions in SQL to access data from different rows and perform data analysis tasks such as finding differences, trends, and patterns.

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I want to design a query to compute some returns for stock data and in searching the 'SQL Server Books Online' I find a very small and not so helpful at all help section on the lead and lag ...