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Mastering SQL is a hands-on experience — learning the concepts is one thing, but writing good queries requires practice. Whether you’re a complete beginner, someone who just finished our SQL Basics course, or an SQL enthusiast who’s simply eager to hone their skills, there’s always room for improvement. This practice set tests your basic SQL knowledge and shows you where you need to improve.

The scope of this practice set includes:

  • simple SELECT queries;
  • aggregate functions (COUNT, SUM, AVG);
  • grouping and ordering results;
  • JOINs (querying from multiple tables, self joins, LEFT JOIN, RIGHT JOIN, and non-equi JOINs);
  • subqueries (simple subqueries, subqueries with multiple results, correlated subqueries, and subqueries in the FROM and SELECT clauses).

The last two parts of the course comprise a special challenge that combines all of the above material for a comprehensive review.

What Do You Need To Take This Course?

Just a web browser and an Internet connection

Who Should Take This Course?

  • Analysts who use relational databases
  • Students taking courses in relational databases
  • Beginning programmers interested in SQL
  • Business database users who want to improve their querying skills
  • Anyone who finished the SQL Basics course or has equivalent knowledge
  • Anyone who wants to practice writing SQL queries
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    One to Rule 'Em All

    Includes 36 courses Python Basics. Part 1, Python Basics. Part 2, Python Basics. Part 3, Python Data Structures in Practice, Built-in Algorithms in Python, Working with Strings in Python, SQL Basics, SQL Practice Set, SQL JOINs, Standard SQL Functions, Creating Basic SQL Reports, Window Functions, Revenue Trend Analysis in SQL, How to INSERT, UPDATE, and DELETE Data in SQL, Recursive Queries, Creating Tables in SQL, Statistics 101, SQL Basics in MS SQL Server, How to Insert, Update, or Delete Data in MS SQL Server, Common Functions in MS SQL Server, Revenue Trend Analysis in SQL Server, Creating Basic SQL Reports in SQL Server, Window Functions in MS SQL Server, Recursive Queries in MS SQL Server, GROUP BY Extensions in MS SQL Server, Introduction to Python for Data Science, How to Read and Write CSV Files in Python, How to Read and Write JSON Files in Python, SQL Basics in PostgreSQL, PostgreSQL JOINs, SQL Practice Set in PostgreSQL, Window Functions in PostgreSQL, Recursive Queries in PostgreSQL, Writing User-Defined Functions in PostgreSQL, PostGIS, How to Read and Write Excel Files in Python

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    Includes 9 courses SQL Basics, SQL Practice Set, SQL JOINs, Standard SQL Functions, Window Functions, How to INSERT, UPDATE, and DELETE Data in SQL, Recursive Queries, Creating Tables in SQL, PostGIS

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    SQL First Aid

    Includes 5 courses SQL Basics, SQL Practice Set, SQL JOINs, Standard SQL Functions, Creating Tables in SQL

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    Basic Data Analytics

    Includes 5 courses SQL Basics, SQL Practice Set, SQL JOINs, Statistics 101, Introduction to Python for Data Science

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    Table of contents

    Progress: 0% completed 0 of 88 exercises done

    1. Warm up: Selecting from one table

    Review the fundamentals of SQL. Practice using SELECT and WHERE to filter data.

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    2. Aggregation and grouping

    Test your knowledge of GROUP BY and ORDER BY clauses.

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    0% completed 0 of 11 exercises done

    3. JOINs

    Practice using JOIN, LEFT JOIN, and non-equi JOIN. Check your skills of working with multiple tables.

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    4. Subqueries

    Verify your knowledge of subqueries. Practice simple and correlated subqueries.

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    0% completed 0 of 15 exercises done

    5. SQL Challenge

    Practice your SQL skills. Write SQL queries which combine SELECT, WHERE, JOIN, GROUP BY, HAVING, ORDER BY and subqueries.

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    0% completed 0 of 21 exercises done

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