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hey everyone today weamp;#39;re going to talk about window functions in SQL a super useful but sometimes confusing feature so I have a very simple table Iamp;#39;ll be using itamp;#39;s called employees thereamp;#39;s 21 rows and each row has an employee number the department of an employee belongs to and their salary so to start I want to talk about aggregate functions and group by whether youamp;#39;re using MySQL or any other SQL flavor we have access to a bunch of these built-in functions like min max standard deviation sum average they will take some number of rows that we have grouped together using Group by and reduce a group of values into a single value so I could do something like this select department and average salary from employees grouping by department so all of the if we go back to the full table all of the engineering rows are grouped together and then we calculated the average all of the sales rows and they were grouped together and we calculated the average so
