Today I was asked to pull some data and give a total difference of two different columns in a table in SQL. Then I realized that not everyone would have came across this. Even though in the past I have showed you how to use the SUM Function in SQL. This time I thought I would go one step further and show you how to get a SUM while using a formula in SQL. Use the SUM() Function to get the total of a specific numeric column. With that being said, the Sum function doesn't need to be a single field. In this case, you can use a formula. Kind of like, getting total Profit by subtracting Expense (Column1) from Total Sales (Column2). Below is the specific syntax to use. SQL SUM Example:
SELECT SUM(Column1 - Column2)
Please note, you can also preform groupings while using this function as well. I will show you those at a later date.