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<h1 id="hd_id3154015" dir="auto">Join Properties</h1>
<p id="par_id3151205" class="paragraph" dir="auto">If you double-click a connection between two linked fields in the query design, or if you choose <span class="emph">Insert - New Relation</span>, the <span class="emph">Join Properties</span> dialog appears. These properties will be used in all queries created in the future.</p>
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<div><p class="howtogetheader" dir="auto"><a name="wie"></a>To access this command...</p></div>
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<div class="embedded"><p class="embedded" dir="auto">Open query design and choose <span class="emph">Insert - New Relation</span>, or double-click on a connection line between two tables.
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<h2 id="hd_id3155066" dir="auto">Tables involved</h2>
<p id="par_id3153924" class="paragraph" dir="auto"><span class="avis">Specifies two different tables that you want to join.</span></p>
<h2 id="hd_id3155766" dir="auto">Fields involved</h2>
<p id="par_id3148994" class="paragraph" dir="auto"><span class="avis">Specifies two data fields that will be joined by a relation.</span></p>
<h2 id="hd_id3159267" dir="auto">Options</h2>
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<h3 id="hd_id3147340" dir="auto">Type</h3>
<p id="par_id3152482" class="paragraph" dir="auto"><span class="avis">Specifies the join type of the selected join.</span> Some databases support only a subset of the various possible types.</p>
<h3 id="hd_id3155334" dir="auto">Inner Join</h3>
<p id="par_id3155936" class="paragraph" dir="auto"><span class="avis">In an inner join, the results table contains only those records for which the content of the linked fields is the same.</span> In LibreOffice SQL this type of link is created by a corresponding WHERE clause.</p>
<h3 id="hd_id3156372" dir="auto">Left Join</h3>
<p id="par_id3166450" class="paragraph" dir="auto"><span class="avis">In a left join, the results table contains all records of the queried fields from the left table and only those records of the queried fields from the right table for which the content of the linked fields is the same.</span> In LibreOffice SQL this type of link corresponds to the LEFT OUTER JOIN command.</p>
<h3 id="hd_id3155607" dir="auto">Right Join</h3>
<p id="par_id3150647" class="paragraph" dir="auto"><span class="avis">In a right join, the results table contains all records of the queried fields from the right table and only those records of the queried fields from the left table for which the content of the linked fields is the same.</span> In LibreOffice SQL this type of link corresponds to the RIGHT OUTER JOIN command.</p>
<h3 id="hd_id3158215" dir="auto">Full Join</h3>
<p id="par_id3163665" class="paragraph" dir="auto"><span class="avis">In a full join, the results table contains all records of the queried fields from the left and right tables.</span> In the SQL of LibreOffice this type of link corresponds to the FULL OUTER JOIN command.</p>
<h3 id="hd_id0305200912031976" dir="auto">Natural</h3>
<p id="par_id0305200912031977" class="paragraph" dir="auto"><span class="avis">In a natural join, the keyword <span class="literal">NATURAL</span> is inserted into the SQL statement that defines the relation. The relation joins all columns that have the same column name in both tables. The resulting joined table contains only one column for each pair of equally named columns.</span></p>
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