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<title>Object Query Language</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Object Query Language</span></span>
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<p><b>Object Query Language</b> (<b>OQL</b>) is a <a href="Query_language" title="Query language">query language</a> standard for <a href="Object_database" title="Object database">object-oriented databases</a> modeled after <a href="SQL" title="SQL">SQL</a> and developed by the <a href="Object_Data_Management_Group" title="Object Data Management Group">Object Data Management Group</a> (ODMG). Because of its overall complexity the complete OQL standard has not yet been fully implemented in any software. The OQL standard influenced the design of later query languages such as JDOQL and <a href="EJB_QL" title="EJB QL">EJB QL</a>, though none are considered to be any version of OQL.
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<div class="mw-heading mw-heading2"><h2 id="General_rules">General rules</h2></div>
<p>The following rules apply to OQL statements:
</p>
<ul><li>All complete statements must be terminated by a semi-colon.</li>
<li>A list of entries in OQL is usually separated by commas but not terminated by a comma(,).</li>
<li>Strings of text are enclosed by matching quotation marks.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Simple_query">Simple query</h3></div>
<p>The following example illustrates how one might retrieve the <a href="CPU" class="mw-redirect" title="CPU">CPU</a>-speed of all PCs with more than 64MB of <a href="Random-access_memory" title="Random-access memory">RAM</a> from a fictional <a href="Personal_computer" title="Personal computer">PC</a> database:
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span class="k">SELECT</span><span class="w"> </span><span class="n">pc</span><span class="p">.</span><span class="n">cpuspeed</span>
<span class="k">FROM</span><span class="w"> </span><span class="n">PCs</span><span class="w"> </span><span class="n">pc</span>
<span class="k">WHERE</span><span class="w"> </span><span class="n">pc</span><span class="p">.</span><span class="n">ram</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">64</span><span class="p">;</span>
</pre></div>
<div class="mw-heading mw-heading3"><h3 id="Query_with_grouping_and_aggregation">Query with grouping and aggregation</h3></div>
<p>The following example illustrates how one might retrieve the average amount of <a href="Random-access_memory" title="Random-access memory">RAM</a> on a <a href="Personal_computer" title="Personal computer">PC</a>, grouped by manufacturer:
</p>
<div class="mw-highlight mw-highlight-lang-sql mw-content-ltr" dir="ltr"><pre><span class="k">SELECT</span><span class="w"> </span><span class="n">manufacturer</span><span class="p">,</span><span class="w"> </span><span class="k">AVG</span><span class="p">(</span><span class="k">SELECT</span><span class="w"> </span><span class="n">part</span><span class="p">.</span><span class="n">pc</span><span class="p">.</span><span class="n">ram</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">partition</span><span class="w"> </span><span class="n">part</span><span class="p">)</span>
<span class="k">FROM</span><span class="w"> </span><span class="n">PCs</span><span class="w"> </span><span class="n">pc</span>
<span class="k">GROUP</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">manufacturer</span><span class="p">:</span><span class="w"> </span><span class="n">pc</span><span class="p">.</span><span class="n">manufacturer</span><span class="p">;</span>
</pre></div>
<p>Note the use of the keyword <code>partition</code>, as opposed to aggregation in traditional SQL.
</p>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite id="CITEREFDietrichUrban2022" class="citation book cs1">Dietrich, Suzanne; Urban, Susan (31 May 2022). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=JYdyEAAAQBAJ&dq=%22Object+Query+Language%22+-wikipedia&pg=PA31">"2.4 The ODMG Query Language"</a>. <i>Fundamentals of Object Databases</i>. <a href="Springer_Nature" title="Springer Nature">Springer Nature</a>. pp. <span class="nowrap">31–</span>52. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-3-031-01844-2</bdi>.</cite></li></ul>
<ul><li><cite id="CITEREFCattellBarryBerler2000" class="citation book cs1">Cattell, Roderic Geoffrey Galton; Barry, Douglas K.; Berler, Mark (2000). "Object Query Language". <a rel="nofollow" class="external text" href="https://books.google.com/books?id=2-FF-aQ_twQC"><i>The Object Data Standard: ODMG 3.0</i></a>. <a href="Morgan_Kaufmann" class="mw-redirect" title="Morgan Kaufmann">Morgan Kaufmann</a>. pp. <span class="nowrap">89–</span>152. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-1-55860-647-0</bdi><span class="reference-accessdate">. Retrieved <span class="nowrap">31 March</span> 2025</span>.</cite></ref></li></ul>
</div>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Object_Data_Management_Group" title="Object Data Management Group">Object Data Management Group</a> (ODMG)</li>
<li>Object Definition Language</li></ul>
<div class="mw-heading mw-heading2"><h2 id="References_2">References</h2></div>
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</style><div id="Query_languages54" style="font-size:114%;margin:0 4em"><a href="Query_language" title="Query language">Query languages</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">In current use</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href=".QL" title=".QL">.QL</a></li>
<li><a href="Alpha_(programming_language)" title="Alpha (programming language)">ALPHA</a></li>
<li><a href="Contextual_Query_Language" title="Contextual Query Language">CQL</a></li>
<li><a href="Cypher_(query_language)" title="Cypher (query language)">Cypher</a></li>
<li><a href="Data_Analysis_Expressions" title="Data Analysis Expressions">DAX</a></li>
<li><a href="Data_Mining_Extensions" title="Data Mining Extensions">DMX</a></li>
<li><a href="Datalog" title="Datalog">Datalog</a></li>
<li><a href="GraphQL" title="GraphQL">GraphQL</a></li>
<li><a href="Graph_Query_Language" title="Graph Query Language">Graph Query Language</a></li>
<li><a href="Gremlin_(query_language)" title="Gremlin (query language)">Gremlin</a></li>
<li><a href="ISBL" title="ISBL">ISBL</a></li>
<li><a href="Lightweight_Directory_Access_Protocol" title="Lightweight Directory Access Protocol">LDAP</a></li>
<li><a href="Language_Integrated_Query" title="Language Integrated Query">LINQ</a></li>
<li><a href="Molecular_Query_Language" title="Molecular Query Language">MQL</a></li>
<li><a href="MultiDimensional_eXpressions" title="MultiDimensional eXpressions">MDX</a></li>
<li><a href="Object_Constraint_Language" title="Object Constraint Language">OCL</a></li>
<li><a href="QUEL_query_languages" title="QUEL query languages">QUEL</a></li>
<li><a href="RDF_query_language" title="RDF query language">RDF</a></li>
<li><a href="SMILES_arbitrary_target_specification" title="SMILES arbitrary target specification">SMARTS</a></li>
<li><a href="SPARQL" title="SPARQL">SPARQL</a></li>
<li><a href="SQL" title="SQL">SQL</a></li>
<li><a href="XQuery" title="XQuery">XQuery</a></li>
<li><a href="XPath" title="XPath">XPath</a></li>
<li><a href="Yahoo!_Query_Language" class="mw-redirect" title="Yahoo! Query Language">YQL</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Proprietary</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Yahoo!_query_language" class="mw-redirect" title="Yahoo! query language">YQL</a></li>
<li><a href="Language_Integrated_Query" title="Language Integrated Query">LINQ</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Superseded</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="CODASYL" title="CODASYL">CODASYL</a></li></ul>
</div></td></tr></tbody></table></div>
<p><br>
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