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 · The LAG () function in SQL is one of the most powerful and flexible tools available for performing advanced data analysis. It is often used to compare rows, calculate differences, …

Nov 18, 2025 · The query uses the LAG function to return the difference in sales quotas for a specific employee over previous calendar quarters. Notice that because there is no lag value …

This tutorial shows you how to use the LAG () function to access a row at a specific physical offset which comes before the current row.

Jul 5, 2024 · One of these powerful functions is the LAG() function, which is one of the commonly used window functions. It opens the door to comparing and calculating the change in values …

Learn SQL LEAD and LAG functions with clear examples. Access previous and next row values, compare records, and prepare for SQL interview questions with confidence.

It allows you to access the data or value from a previous row without using any SELF JOIN. This LAG function is beneficial in comparing the current row value with its previous row so that you …

The SQL LAG () function is a powerful analytical function that allows you to access data from a previous row within a result set. Specifically, it allows you to retrieve data from a specified …

The LAG function in SQL is a dynamic window function that allows you to access the value of a column from the previous row within a defined window, making it ideal for tasks like analyzing …

Jun 11, 2024 · SQL w indow functions, also known as analytical functions or OVER functions, add a new dimension to data analysis. They allow you to include aggregates or data from other …