http://openeducation.wiki/w/index.php?action=history&feed=atom&title=Help%3AUnions_of_resultsHelp:Unions of results - Revision history2026-04-11T13:09:50ZRevision history for this page on the wikiMediaWiki 1.39.1http://openeducation.wiki/w/index.php?title=Help:Unions_of_results&diff=41231&oldid=prevPbacsich at 20:59, 2 May 20232023-05-02T20:59:12Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>To combine multiple queries, you can also use <del style="font-weight: bold; text-decoration: none;">[</del>https://www.semantic-mediawiki.org/wiki/Extension:Semantic_Compound_Queries<del style="font-weight: bold; text-decoration: none;">|Semantic Compound Queries]</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>To combine multiple queries, you can also use https://www.semantic-mediawiki.org/wiki/Extension:Semantic_Compound_Queries</div></td></tr>
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</table>Pbacsichhttp://openeducation.wiki/w/index.php?title=Help:Unions_of_results&diff=41230&oldid=prevPbacsich: copied from https://www.semantic-mediawiki.org/wiki/Help:Unions_of_results2023-05-02T20:57:48Z<p>copied from https://www.semantic-mediawiki.org/wiki/Help:Unions_of_results</p>
<p><b>New page</b></p><div>== Unions (OR) of result ==<br />
This page is copied from https://www.semantic-mediawiki.org/wiki/Help:Unions_of_results<br />
<br />
'''Disjunctions''' 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 ([[wikipedia:Logical disjunction|logical OR]]).<br />
<br />
Semantic MediaWiki has two ways of writing disjunctions in queries:<br />
* The operator '''<code>OR</code>''' is used for taking the union of two queries.<br />
* The operator '''<code>||</code>''' is used for disjunctions in property values, page names and category names.<br />
<br />
<br />
For example, a query that describes pages of actors in <code><nowiki>[[Category:Musical actor]]</nowiki></code> ''or'' <code><nowiki>[[Category:Theatre actor]]</nowiki></code>, ''or'' in both of them, can be written as:<br />
: <code><nowiki>[[Category:Musical actor]] OR [[Category:Theatre actor]]</nowiki></code><br />
or more concisely,<br />
: <code><nowiki>[[Category:Musical actor||Theatre actor]]</nowiki></code><br />
<br />
<br />
Similarly, a query that describes all pages of people born in Boston ''or'' New York can be written using one of these operators:<br />
: <code><nowiki>[[Born in::Boston]] OR [[Born in::New York]]</nowiki></code><br />
or again more concisely,<br />
: <code><nowiki>[[Born in::Boston||New York]]</nowiki></code><br />
<br />
<br />
Note that <code>||</code> does not always offer an alternative to <code>OR</code>. For example,<br />
: <code><nowiki>[[Born in::Boston]] OR [[Category:Actor]]</nowiki></code><br />
cannot be expressed with <code>||</code>.<br />
<br />
<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 ''or'' in New York, the category name needs to be repeated:<br />
* <code><nowiki>[[Category:Actor]] [[Born in::Boston]] OR [[Category:Actor]] [[Born in::New York]]</nowiki></code><br />
<br />
<br />
To combine multiple queries, you can also use [https://www.semantic-mediawiki.org/wiki/Extension:Semantic_Compound_Queries|Semantic Compound Queries]<br />
<br />
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> [[Help:Index]]<br />
[[Category:ZWIKI Help]]</div>Pbacsich