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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Range query (database)</span></span>
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</style><div role="note" class="hatnote navigation-not-searchable">For the problem in <a href="Computer_science" title="Computer science">computer science</a>, see <a href="Range_query_(computer_science)" title="Range query (computer science)">Range query (computer science)</a>.</div>
<p>A <b>range query</b> is a common <a href="Database" title="Database">database</a> operation that retrieves all <a href="Row_(database)" title="Row (database)">records</a> where some <a href="Variable_(mathematics)" title="Variable (mathematics)">value</a> is between an upper and lower boundary.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> For example, list all employees with 3 to 5 years' experience. Range queries are unusual because it is not generally known in advance how many entries a range query will return, or if it will return any at all. Many other queries, such as the top ten most senior employees, or the newest employee, can be done more efficiently because there is an upper bound to the number of results they will return. A query that returns exactly one result is sometimes called a <a href="Singleton_(mathematics)" title="Singleton (mathematics)">singleton</a>.
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<div class="mw-heading mw-heading2"><h2 id="Partial_match_query">Partial match query</h2></div>
<p>Match at least one of the requested keys.
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<ul><li><a href="B%2B_tree" title="B+ tree">B+ tree</a></li>
<li><a href="K-d_tree" title="K-d tree">k-d tree</a></li>
<li><a href="R-tree" title="R-tree">R-tree</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Range_searching" title="Range searching">Range searching</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.w3schools.com/sql/sql_between.asp">"SQL BETWEEN Operator"</a>. <i>W3Schools</i><span class="reference-accessdate">. Retrieved <span class="nowrap">4 November</span> 2014</span>.</cite></span>
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