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class="firstHeading">Unions (OR) of results</h1>  <div id="siteSub">From semantic-mediawiki.org</div>  <div id="contentSub" class="small"><div id="sbl-breadcrumbs" class="sbl-breadcrumb-trail-light" dir="ltr"><span class="sbl-breadcrumb-arrow-parent" style=""><a href="/web/20230219232526/https://www.semantic-mediawiki.org/wiki/Help:User_manual" title="Help:User manual">User manual</a></span><span class="sbl-breadcrumb-arrow-right" style=""></span><span class="sbl-breadcrumb-arrow-parent" style=""><a href="/web/20230219232526/https://www.semantic-mediawiki.org/wiki/Help:Semantic_search" title="Help:Semantic search">Semantic search</a></span><span class="sbl-breadcrumb-arrow-right" style=""></span><span class="sbl-breadcrumb-arrow-parent" style=""><a href="/web/20230219232526/https://www.semantic-mediawiki.org/wiki/Help:Selecting_pages" title="Help:Selecting pages">Selecting pages</a></span><span class="sbl-breadcrumb-arrow-right" style=""></span><span class="sbl-breadcrumb-arrow-location" style="">Unions (OR) of results</span></div></div><div id="jump-to-nav" class="mw-jump">Jump to:<a href="#mw-navigation">navigation</a>, <a href="#p-search">search</a></div> </div> <div id="bodyContent">  <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="mw-parser-output"> <div class="sil-interlanguagelink"></div> <p><b>Disjunctions</b> are OR-conditions that admit several alternative conditions on query results. A disjunction requires that at least one (but maybe more than one) of the possible alternatives is satisfied (<a href="https://web.archive.org/web/20230219232526/https://en.wikipedia.org/wiki/Logical_disjunction" class="extiw" title="wikipedia:Logical disjunction">logical OR</a>). </p><p>Semantic MediaWiki has two ways of writing disjunctions in queries: </p> <ul><li>The operator <b><code>OR</code></b> is used for taking the union of two queries.</li> <li>The operator <b><code>||</code></b> is used for disjunctions in property values, page names and category names.</li></ul> <p><br/> For example, a query that describes pages of actors in <code>[[Category:Musical actor]]</code> <i>or</i> <code>[[Category:Theatre actor]]</code>, <i>or</i> in both of them, can be written as: </p> <dl><dd><code>[[Category:Musical actor]] OR [[Category:Theatre actor]]</code></dd></dl> <p>or more concisely, </p> <dl><dd><code>[[Category:Musical actor||Theatre actor]]</code></dd></dl> <p><br/> Similarly, a query that describes all pages of people born in Boston <i>or</i> New York can be written using one of these operators: </p> <dl><dd><code>[[Born in::Boston]] OR [[Born in::New York]]</code></dd></dl> <p>or again more concisely, </p> <dl><dd><code>[[Born in::Boston||New York]]</code></dd></dl> <p><br/> Note that <code>||</code> does not always offer an alternative to <code>OR</code>. For example, </p> <dl><dd><code>[[Born in::Boston]] OR [[Category:Actor]]</code></dd></dl> <p>cannot be expressed with <code>||</code>. </p><p><br/> OR operates on the query, not on a single element of the query. Thus in the following query, which is intended to list actors born in Boston <i>or</i> in New York, the category name needs to be repeated: </p> <ul><li><code>[[Category:Actor]] [[Born in::Boston]] OR [[Category:Actor]] [[Born in::New York]]</code></li></ul> <p><br/> To combine multiple queries, you can also use <span class="smw-highlighter smwttinline" data-state="inline"><a href="/web/20230219232526/https://www.semantic-mediawiki.org/wiki/Extension:Semantic_Compound_Queries" title="Extension:Semantic Compound Queries">extension "Semantic Compound Queries"</a><span class="smwttcontent">Provides a parser function that displays multiple semantic queries at the same time</span></span>. </p>   </div>  </div><div class="printfooter"> Retrieved from "<a dir="ltr" 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