Which join returns all the rows of the table on the right side of the join and matching rows for the table on the left side of join?

What is Full Outer Join in SQL?

In SQL the FULL OUTER JOIN combines the results of both left and right outer joins and returns all (matched or unmatched) rows from the tables on both sides of the join clause.

Pictorial Presentation: SQL Full Outer Join

Syntax:

Syntax diagram - FULL OUTER JOIN

Example: SQL Full Outer Join

Let’s combine the same two tables using a full join.

SQL Code:

Output:

Because this is a full join, all rows (both matching and nonmatching) from both tables are included in the output. There is only one match between table table_A and table table_B, so only one row of output displays values in all columns. All remaining rows of output contain only values from table table_A or table table_B, with the remaining columns set to missing values

only one row of output displays values in all columns explain below -

Example: SQL Full Outer Join between two tables

Here is an example of full outer join in SQL between two tables.

Sample table: foods

Sample table: company

As we know the FULL OUTER JOIN is the combination of the results of both LEFT OUTER JOIN and RIGHT OUTER JOIN, so, here we are going to describe how FULL OUTER JOIN perform internally.

Pictorial Presentation SQL Full Outer Join:

Here is the SQL statement which returns all rows from the 'foods' table and 'company' table using "FULL OUTER JOIN" clause.

SQL Code:

Output:

FULL OUTER JOIN using WHERE clause

We can include a WHERE clause with a FULL OUTER JOIN to get return only those rows where no matching data between the joining tables are exist.

The following query returns only those company that have no matching food product in foods, as well as that food product in foods that are not matched to the listed company.

Output:

Full Outer Join using Union clause

A UNION clause can be used as an alternate to get the same result as FULL OUTER JOIN

Here is the example:

Here is the SQL statement:

FULL OUTER JOIN using LEFT and RIGHT OUTER JOIN and UNION clause

The following code is, the combination of LEFT OUTER JOIN and RIGHT OUTER JOIN and combined by, using UNION clause

Note: Outputs of the said SQL statement shown here is taken by using Oracle Database 10g Express Edition.

Click on the following to get the slides presentation of all JOINS -

Here is a new document which is a collection of questions with short and simple answers, useful for learning SQL as well as for interviews.

Practice SQL Exercises

• SQL Exercises, Practice, Solution
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• SQL Wildcard and Special operators [22 Exercises]
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• SQL Formatting query output [10 Exercises]
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• SQL JOINS
• SQL JOINS [29 Exercises]
• SQL JOINS on HR Database [27 Exercises]
• SQL SUBQUERIES
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• SQL View[16 Exercises]
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• Movie Database
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• SUBQUERIES on movie Database [16 Exercises]
• JOINS on movie Database [24 Exercises]
• Soccer Database
• Introduction
• BASIC queries on soccer Database [29 Exercises]
• SUBQUERIES on soccer Database [33 Exercises]
• JOINS queries on soccer Database [61 Exercises]
• Hospital Database
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• BASIC, SUBQUERIES, and JOINS [39 Exercises]
• Employee Database
• BASIC queries on employee Database [115 Exercises]
• SUBQUERIES on employee Database [77 Exercises]
• More to come!

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