Robert Cain continues a series on learning KQL:
When dealing with data, it’s not at all uncommon to want to create a new column of data by performing a calculation with two other columns. A common example is taking two stored columns, the purchase price of an item, and its shipping cost, then adding them together to get a column which wasn’t stored in your dataset, the total amount of the sale.
The Kusto Query Language lets you accomplish this through the
extendoperator. This operator allows you to manifest new columns in your output data, based on calculations.
As always, Robert has plenty of examples available to view.