{"id":199307,"date":"2025-05-04T04:09:24","date_gmt":"2025-05-04T04:09:24","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-add-previous-row-value-in-sql\/"},"modified":"2025-05-04T04:09:24","modified_gmt":"2025-05-04T04:09:24","slug":"how-to-add-previous-row-value-in-sql","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-add-previous-row-value-in-sql\/","title":{"rendered":"How to add previous row value in SQL?"},"content":{"rendered":"

To add the previous row value in SQL, you can use window functions like LAG or lead. These functions allow you to access data from the previous or next row within the result set.<\/strong><\/p>\n

When working with SQL queries, it is common to need to perform calculations that involve the values from the previous row. Whether you are trying to calculate a running total, find the difference between consecutive rows, or simply reference the value from the previous row, window functions can help you achieve this.<\/p>\n

One of the most common scenarios where you might need to add the value from the previous row is when calculating a running total. This can be useful in scenarios where you need to track cumulative values over time, such as sales figures or inventory levels.<\/p>\n

Let’s take a look at an example of how you can add the value from the previous row in SQL using the LAG function.<\/p>\n

“`sql
\nSELECT
\n value,
\n LAG(value, 1) OVER (ORDER BY id) + value AS running_total
\nFROM
\n your_table;
\n“`<\/p>\n

In this query, we are selecting the `value` column from `your_table` and using the `LAG` function to access the value from the previous row. We then add this value to the current row’s value to calculate the running total.<\/p>\n

Using window functions like LAG or lead can help you solve a variety of problems where you need to reference values from previous or next rows in your SQL queries.<\/p>\n

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