SQL LAG Function: Calculate Row Differences

1 year ago
Emily Johnson
1 minute

You can use the LAG function to retrieve the value from the previous row and then calculate the difference with the current row. Here is an example:

SELECT 
    col1,
    col2,
    col2 - LAG(col2) OVER(ORDER BY col1) AS diff
FROM 
    your_table;

In this example, col1 and col2 are the column names in your table. LAG(col2) OVER(ORDER BY col1) means to retrieve the value of col2 from the previous row, and then calculate the difference between neighboring rows using col2 – LAG(col2) OVER(ORDER BY col1) and name it as the diff column.

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