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Question :

How To Write a Query with a Full Outer Join in MS SQL Server?

Category MS SQL Server Interview Questions
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Added on 9/23/2014
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Question :

How To Write a Query with a Full Outer Join in MS SQL Server?


Answer:

If you want to query from two tables with a full outer join, you can use the FULL OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a full outer join from two tables: ggl_links and ggl_rates. The join condition is that the id in the ggl_links table equals to the id in the ggl_rates table:

SELECT l.id, l.url, r.comment FROM ggl_links l
FULL OUTER JOIN ggl_rates r ON l.id = r.id
GO



id url comment

101 www.globalguideline.com The best

102 www.globalguideline.com/html Well done

103 www.globalguideline.com/seo Thumbs up

104 www.google.com NULL

105 www.yahoo.com NULL

106 www.php.net NULL

107 www.mysql.com NULL

NULL NULL Number 1

NULL NULL Not bad

NULL NULL Good job

NULL NULL Nice tool


As you can see, an full outer join returns 3 groups of rows:

* The rows from both tables that satisfy the join condition.
* The rows from the first (left) table that do not satisfy the join condition.
* The rows from the second (right) table that do not satisfy the join condition.
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