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1. Introduction
Limiting the output
Eliminating duplicate results
HAVING: filtering and ordering groups
Let's practice


Welcome to the fourth part of our Basics of PostgreSQL course.

In the previous two parts, you've learned how to select data from single and multiple tables. You know how to filter rows and join columns from different tables. Now it's time to move on.

In this part, you'll learn how to compute statistics, group rows, and filter such groups. Such operations are extremely important for preparing reports and always come in handy in big tables.

Are you ready?


Click Next exercise to proceed.