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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

FROM  dbo.titles LEFT OUTER JOIN

               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

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm
 

 

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