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According to the SQL:2006 standard, natural joins and named column joins support both inner and outer joins. However, this can vary from SQL implementation to implementation, so be sure to check the product documentation. By default, a join is processed as an inner join unless specifically defined as an outer join.
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Now that you have a general overview of the condition join, let s take a closer look at the inner join. The inner join is the most common of the condition joins and is specified by using the INNER JOIN keywords. However, the INNER keyword is not required. If JOIN is used alone, an inner join is assumed. In addition to the JOIN keyword (specified in the FROM clause), you must also define an ON clause, which immediately follows the FROM clause. Let s take a look at an example to see how this works. Suppose you want to join the CD_TITLES table and the TITLES_ARTISTS table, shown in Figure 11-4. In the following example, an inner join has been created that is based on the TITLE_ID columns in the two tables:
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SELECT t.TITLE, ta.ARTIST_ID FROM CD_TITLES t INNER JOIN TITLES_ARTISTS ta ON t.TITLE_ID = ta.TITLE_ID WHERE t.TITLE LIKE ('%Blue%');
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The statement uses the INNER JOIN keywords to join the CD_TITLES and TITLES_ ARTISTS tables. The equi-join condition is defined in the ON clause, using the TITLE_ID column in each table. Notice that correlation names have been defined on both tables. The SELECT statement is further qualified by the WHERE clause, which returns only those rows that contain Blue in the TITLE column of the CD_TITLES table. When you execute this query, you receive the following query results:
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TITLE -------------------Famous Blue Raincoat Blue Blues on the Bayou ARTIST_ID --------2001 2002 2013
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CD_TITLES TITLE_ID: TITLE: VARCHAR(60) INT 101 102 103 104 105 106 107 108 109 110 111 112 113 Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits Carreras Domingo Pavarotti in Concert Out of Africa Leonard Cohen The Best of Fundamental Blues on the Bayou Orlando
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TITLES_ARTISTS TITLE_ID: ARTIST_ID: INT INT 101 102 103 104 105 106 107 108 108 108 109 110 111 112 113 113 2001 2002 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
CD_ARTISTS ARTIST_ID: ARTIST: INT VARCHAR(60) 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Jennifer Warnes Joni Mitchell William Ackerman Kitaro Bing Crosby Patsy Cline Jose Carreras Luciano Pavarotti Placido Domingo John Barry Leonard Cohen Bonnie Raitt B.B. King David Motion Sally Potter
Figure 11-4
Joining the CD_TITLES, TITLES_ARTISTS, and CD_ARTISTS tables
As you can see, the results include information from both tables: the TITLE column from the CD_TITLES table and the ARTIST_ID column from the TITLES_ARTISTS table. Although this information can be useful, it might be better for some users if they can view the actual names of the artists, rather than numbers. The way to achieve this is to include a third table in the join. Let s return to the previous example and add a second join condition to the CD_ARTISTS table (shown in Figure 11-4). In the following example, the second condition is added immediately after the original ON clause:
SELECT t.TITLE, a.ARTIST FROM CD_TITLES t INNER JOIN TITLES_ARTISTS ta ON t.TITLE_ID = ta.TITLE_ID INNER JOIN CD_ARTISTS a ON ta.ARTIST_ID = a.ARTIST_ID WHERE t.TITLE LIKE ('%Blue%');
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Notice that the INNER JOIN keywords are repeated, followed by the name of the third table, which is then followed by another ON clause. In this clause, the equi-join condition is defined on the ARTIST_ID columns in the TITLES_ARTISTS and CD_ARTISTS tables. Keep in mind that you do not need to include the INNER keyword, nor do the columns specified in the ON clause need to have the same name. If you execute this statement, you ll receive the following query results:
TITLE -------------------Famous Blue Raincoat Blue Blues on the Bayou ARTIST --------------Jennifer Warnes Joni Mitchell B.B. King
Notice that the artist names are now listed in the results. Also notice that the fact that three tables have been used to retrieve this information is invisible to whoever views the query results.
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