Basic Course

SQL JOINs

Review and deepen your knowledge of SQL JOINs with 93 exercises. Practice common and less common ways of getting data from multiple tables.

4.83 ★★★★★ ★★★★★ (8249 ratings)

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Time to complete 10 h

Coding challenges 93

Skills you will gain

  • JOINing and selecting data from more than one table
  • JOINIng many tables in a single query
  • The use cases of LEFT JOIN, RIGHT JOIN, and FULL JOIN
  • How to correctly filter data with different kinds of JOINs
  • How to join a given table with itself
  • How to join tables on non-key columns

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Table of contents

Course progress 0%

Exercises completed 0/93

  1. Recap of SQL JOIN types

    0/21

    Review the most common types of JOINs. Practice JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN and others.

  2. Multiple JOINs

    0/13

    Refine your joining skills. Exercise joining more than two tables in one SQL query.

  3. Joining a table with itself

    0/12

    Learn how to join SQL table with itself.

  4. Non-equi JOINs

    0/29

    Practice joins with less common conditions: non-equi JOINs and joins between non-key columns.

  5. Challenge

    0/18

    Check your knowledge in the challenge.

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Description

JOINs are one of the most fundamental and commonly used features of the SQL language. It's safe to say that at least basic knowledge of querying data from more than one table is an absolute must for every SQL user.

This course covers all important types of SQL JOINs that are widely used by SQL programmers to query databases on a daily basis.

Cover image for the course 'SQL JOINs'

This course is intended for users who have very basic experience with SQL. We assume you know how to write simple queries to select data from a single table.

What Do You Need to Take This Course?

Just a web browser and an Internet connection.

This Course Will Teach You:

  • JOINing and selecting data from more than one table
  • JOINIng many tables in a single query
  • The use cases of LEFT JOIN, RIGHT JOIN, and FULL JOIN
  • How to correctly filter data with different kinds of JOINs
  • How to join a given table with itself
  • How to join tables on non-key columns

You'll also delve into the interesting topic of non-equi JOINs.

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 wants to improve or practice their knowledge of SQL JOINs

Reviews (17)

Average rating

4.83/5

★★★★★ ★★★★★ (8249 ratings)

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