Web Reference: This tutorial shows you how to use the SQL LAG () function to access data of the previous row from the current row. Sep 13, 2025 · Let's look at some examples of SQL LAG function and understand how to use LAG Function in SQL. Suppose we want to track the revenue of a news organization over the years, comparing each year’s revenue to the previous year’s revenue. Nov 18, 2025 · 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.
YouTube Excerpt: In this video, I start by showing you our sample data. Time shifting data for comparison After understanding the sample data, I will ...
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