SQL Outer Join

This lesson covers both the left outer join, the right outer join, and the full outer join, and explains the differences between them. There are some occasions where you would need to use a left outer join or a right outer join, and others where you would need a full outer join. The join type you use will depend on the situation and what data you need to return.

Left Outer Join

Use this when you only want to return rows that have matching data in the left table, even if there's no matching rows in the right table.

Example SQL statement

Code
SELECT * FROM Individual AS Ind LEFT JOIN Publisher AS Pub ON Ind.IndividualId = Pub.IndividualId

Source Tables

Left Table

Id	FirstName	LastName	UserName
1	Fred	Flinstone	freddo
2	Homer	Simpson	homey
3	Homer	Brown	notsofamous
4	Ozzy	Ozzbourne	sabbath
5	Homer	Gain	noplacelike

Right Table

IndividualId	AccessLevel
1	Administrator
2	Contributor
3	Contributor
4	Contributor
10	Administrator

Result

Right Outer Join

Use this when you only want to return rows that have matching data in the right table, even if there's no matching rows in the left table.

Example SQL statement

Code
SELECT * FROM Individual AS Ind RIGHT JOIN Publisher AS Pub ON Ind.IndividualId = Pub.IndividualId

Source Tables

Left Table

Id	FirstName	LastName	UserName
1	Fred	Flinstone	freddo
2	Homer	Simpson	homey
3	Homer	Brown	notsofamous
4	Ozzy	Ozzbourne	sabbath
5	Homer	Gain	noplacelike

Right Table

IndividualId	AccessLevel
1	Administrator
2	Contributor
3	Contributor
4	Contributor
10	Administrator

Result

Full Outer Join

Use this when you want to all rows, even if there's no matching rows in the right table.

Example SQL statement

Code
SELECT * FROM Individual AS Ind FULL JOIN Publisher AS Pub ON Ind.IndividualId = Pub.IndividualId

Source Tables

Left Table

Id	FirstName	LastName	UserName
1	Fred	Flinstone	freddo
2	Homer	Simpson	homey
3	Homer	Brown	notsofamous
4	Ozzy	Ozzbourne	sabbath
5	Homer	Gain	noplacelike

Right Table

IndividualId	AccessLevel
1	Administrator
2	Contributor
3	Contributor
4	Contributor
10	Administrator

Result

• << Inner Join
• SQL Insert >>

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