This repository contains a collection of SQL queries demonstrating the use of aggregate functions and SQL clauses as part of a database assignment.

If you have an aggregation function (sum, avg, count) in your select clause or if you have a group by clause, all of your columns must be aggregated or grouped.<BR><BR>In the version of SQL that I ...

SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.