This online practice set consists of 88 interactive exercises. You will practice using simple statements and clauses, like SELECT or JOIN, as well as more advanced concepts, such as subqueries.
This exercise set is designed for users who already know how to write basic PostgreSQL queries. It will also be of interest to anyone who wants some online practice to polish or refresh their knowledge of writing queries in PostgreSQL. Keep reading for more details!
What does it take to master a skill? There are several different requirements, but one aspect they have in common is that they require practice. It's no different from writing code. The theory is one thing, but the real fun starts when you work with it for online practice or apply it in a real-world scenario.
So, whether you're a beginner taking your first steps towards writing SQL queries in PostgreSQL or a specialist who wants to refresh your SQL skills through practice, this exercise set will check your knowledge level and show you what you still need to catch up on.
There is always room for development, and today is your chance to complete an exercise or two and ultimately polish your SQL toolkit!
Review the fundamentals of SQL. Practice using SELECT and WHERE to filter data.
Test your knowledge of GROUP BY and ORDER BY clauses.
Practice using JOIN, LEFT JOIN, and non-equi JOIN. Check your skills of working with multiple tables.
Verify your knowledge of subqueries. Practice simple and correlated subqueries.
Practice your SQL skills. Write SQL queries which combine SELECT, WHERE, JOIN, GROUP BY, HAVING, ORDER BY and subqueries.