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SQL Inner Join

As discussed in the previous lesson, you should use the SQL INNER JOIN when you only want to return records where there is at least one row in both tables that match the join condition.

Example SQL statement

SELECT * FROM Individual
INNER JOIN Publisher
ON Individual.IndividualId = Publisher.IndividualId
WHERE Individual.IndividualId = '2'

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

IndividualId	FirstName	LastName	UserName	IndividualId	AccessLevel
2	Homer	Simpson	homey	2	Contributor

Next lesson covers the SQL OUTER JOIN.

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