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  SQL Server Tips by Gama and Naughter

Outer right

An outer right join is similar to the outer left but returning all the rows from the table on the right instead of the left.

Example: To display all titles, even the ones with no publishers in the publisher's database, in this situation the publisher will be NULL.

SELECT dbo.publishers.pub_name, dbo.titles.title
FROM dbo.publishers RIGHT OUTER JOIN
dbo.titles ON dbo.publishers.pub_id = dbo.titles.pub_id

Does it mean that an outer right join will become an outer left join if the tables switch places around the JOIN clause? Yes, it is that simple for joins between two tables but it gets more complicated if more tables are involved. The next example proves that an outer right join and an outer left join return identical results by switching the places of the joined tables:

SELECT dbo.publishers.pub_name, dbo.titles.title
dbo.publishers ON dbo.publishers.pub_id = dbo.titles.pub_id

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter  


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