Summary
This tutorial provided a comprehensive overview of aggregate functions and data grouping techniques in SQL, specifically in the context of PostgreSQL.
You should now be able to use functions such as COUNT, SUM, AVG, MIN, and MAX to perform calculations across multiple rows, as well as organize and summarize data using the GROUP BY and HAVING clauses.
By learning these concepts, you're well-equipped to analyze trends, generate meaningful summaries and filter grouped results effectively within relational databases.