Amazon Redshift cloud data warehouse supports many useful windows or analytical functions. Many Redshift reporting queries use the analytic functions such as cumulative sum and average. But, because of Redshift limitation, you cannot call an analytics function within another. Whenever you try to call an analytics function within another analytics function, you will end up with an error such as "Invalid operation: aggregate function calls may not have nested aggregate or window function". In this article, we will check how to use the nested window functions in Amazon Redshift with…