SQL Outer Join Tutorial – With Example Syntax

SQL Outer Join Tutorial – With Example Syntax

In SQL, there are four different types of SQL JOINs: INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN. In this article, we will be discussing FULL OUTER JOIN. The FULL OUTER JOIN (aka OUTER JOIN) is used to return all of the records that have values in either the left or right table.

What are SQL JOINs?

In SQL, JOINs are used to unite the rows of two or more tables, based on a column that is shared between them.

There are four different types of JOINs: INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN. In this article, we will be discussing FULL OUTER JOIN.

What is a Full Outer Join in SQL?

The FULL OUTER JOIN (aka OUTER JOIN) is used to return all of the records that have values in either the left or right table.

For example, a full outer join of a table of customers and a table of orders might return all customers, including those without any orders, as well as all of the orders. Customers who have made orders would be united with their orders using their customer id number.

A full outer join can return a lot of data, so before you use it, consider whether a more conservative method might meet your needs.

Sample Data Set

Imagine that you are teaching an American Literature class. You have ten students, and you want each of them to read a different book from a list of pre-approved classic American novels. Some students have chosen the book they will read, while others have not done so yet.

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