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  • INTERVIEW QUESTIONS DATABASE MS SQLSERVER DETAILS
    Question :
    How To Write a Query with a Full Outer Join in MS SQL Server?
    Category MS SqlServer Interview Questions
    Rating (0.4) By 1177 users
    Added on 9/23/2009
    Views 1614
    Rate it!
    Answers:

    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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