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<?xml version="1.0" encoding="UTF-8"?>
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<helpdocument version="1.0">
<meta>
<topic id="textsharedexplorerdatabase02010101xml" indexer="include" status="PUBLISH">
<title id="tit" xml-lang="en-US">Relations</title>
<filename>/text/shared/explorer/database/02010101.xhp</filename>
</topic>
<history>
<created date="2003-10-31T00:00:00">Sun Microsystems, Inc.</created>
<lastedited date="2006-02-23T16:52:17">converted from old format - fpe</lastedited>
</history>
</meta>
<body>
<bookmark xml-lang="en-US" branch="index" id="bm_id3154015"><bookmark_value>join properties in relational databases</bookmark_value>
<bookmark_value>link properties in relational databases</bookmark_value>
<bookmark_value>inner joins in relational databases</bookmark_value>
<bookmark_value>joins in databases</bookmark_value>
<bookmark_value>left joins in relational databases</bookmark_value>
<bookmark_value>right joins in relational databases</bookmark_value>
<bookmark_value>full joins in relational databases</bookmark_value>
</bookmark>
<paragraph role="heading" id="hd_id3154015" xml-lang="en-US" level="1" l10n="U" oldref="1">Relations</paragraph>
<paragraph role="paragraph" id="par_id3151205" xml-lang="en-US" l10n="U" oldref="2">If you double-click a connection between two linked fields in the query design, or if you choose <emph>Insert - New Relation</emph>, the <emph>Relations</emph> dialog appears. These properties will be used in all queries created in the future.</paragraph>
<paragraph role="paragraph" id="par_id3146789" xml-lang="en-US" l10n="E" localize="false"><link href="text/shared/00/00000450.xhp#Joins"><embedvar href="text/shared/00/00000004.xhp#wie"/></link></paragraph>
<bookmark xml-lang="en-US" branch="hid/HID_DLG_QRY_LEFT_TABLE" id="bm_id3150749" localize="false"/>
<bookmark xml-lang="en-US" branch="hid/HID_DLG_QRY_RIGHT_TABLE" id="bm_id3150752" localize="false"/>
<paragraph role="heading" id="hd_id3155066" xml-lang="en-US" level="2" l10n="U" oldref="17">Tables involved</paragraph>
<paragraph role="paragraph" id="par_id3153924" xml-lang="en-US" l10n="U" oldref="16"><ahelp hid="HID_DLG_QRY_RIGHT_TABLE">Specifies two different tables that you want to join.</ahelp></paragraph><comment>UFI: removed a help id</comment>
<paragraph role="heading" id="hd_id3155766" xml-lang="en-US" level="2" l10n="U" oldref="15">Fields involved</paragraph>
<paragraph role="paragraph" id="par_id3148994" xml-lang="en-US" l10n="CHG" oldref="14"><ahelp hid=".">Specifies two data fields that will be joined by a relation.</ahelp></paragraph>
<paragraph role="heading" id="hd_id3159267" xml-lang="en-US" level="2" l10n="U" oldref="3">Options</paragraph>
<bookmark xml-lang="en-US" branch="hid/HID_DLG_QRY_JOINTYPE" id="bm_id3147321" localize="false"/>
<paragraph role="heading" id="hd_id3147340" xml-lang="en-US" level="3" l10n="U" oldref="13">Type</paragraph>
<paragraph role="paragraph" id="par_id3152482" xml-lang="en-US" l10n="U" oldref="4"><ahelp hid="HID_DLG_QRY_JOINTYPE">Specifies the link type of the selected link.</ahelp> Queries about the various types of links differ in the number of records displayed. The following options are available:</paragraph>
<paragraph role="heading" id="hd_id3155334" xml-lang="en-US" level="3" l10n="U" oldref="5">Inner Join</paragraph>
<paragraph role="paragraph" id="par_id3155936" xml-lang="en-US" l10n="U" oldref="6"><ahelp hid="HID_DLG_QRY_JOINTYPE">With the internal join, the results table contains only the records for which the content of the linked fields is the same.</ahelp> In $[officename] SQL this type of link is created by a corresponding WHERE clause.</paragraph>
<paragraph role="heading" id="hd_id3156372" xml-lang="en-US" level="3" l10n="U" oldref="7">Left Join</paragraph>
<paragraph role="paragraph" id="par_id3166450" xml-lang="en-US" l10n="U" oldref="8"><ahelp hid="HID_DLG_QRY_JOINTYPE">With the left join, the results table contains all fields of the left table and only those fields of the right table for which the content of the linked fields is the same.</ahelp> In $[officename] SQL this type of link corresponds to the LEFT OUTER JOIN command.</paragraph>
<paragraph role="heading" id="hd_id3155607" xml-lang="en-US" level="3" l10n="U" oldref="9">Right Join</paragraph>
<paragraph role="paragraph" id="par_id3150647" xml-lang="en-US" l10n="U" oldref="10"><ahelp hid="HID_DLG_QRY_JOINTYPE">With the right join, the results table contains all fields of the right table and only those fields of the left table for which the content of the linked fields is the same.</ahelp> In $[officename] SQL this type of link corresponds to the RIGHT OUTER JOIN command.</paragraph>
<paragraph role="heading" id="hd_id3158215" xml-lang="en-US" level="3" l10n="U" oldref="11">Full Join</paragraph>
<paragraph role="paragraph" id="par_id3163665" xml-lang="en-US" l10n="U" oldref="12"><ahelp hid="HID_DLG_QRY_JOINTYPE">For a full join, the results table contains all fields of the left and right tables.</ahelp> In the SQL of $[officename] this type of link corresponds to the FULL OUTER JOIN command.</paragraph>
</body>
</helpdocument>
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