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1. Introduction
GROUP BY – Recap


Welcome! The aim of this course is to teach you how to use various GROUP BY extensions: ROLLUP, CUBE, and GROUPING SETS. They are often used to create advanced reports with SQL.

We assume that you already know a lot of SQL and can put that knowledge into practice. In particular, you know how to group rows by single or multiple columns and how to calculate aggregate functions: sums, averages, maximal values, etc.

So, are you ready?


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