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http://github.com/valkey-io/valkey
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64 lines
4.7 KiB
HTML
64 lines
4.7 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<link type="text/css" rel="stylesheet" href="style.css" />
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<a href="index.html">
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<img style="border:none" alt="Redis Documentation" src="redis.png">
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<div class="index">
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<!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. -->
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<b>SortCommand: Contents</b><br> <a href="#Return value">Return value</a>
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<h1 class="wikiname">SortCommand</h1>
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<div class="summary">
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= SORT <i>key</i> <code name="code" class="python">[</code>BY <i>pattern</i><code name="code" class="python">]</code> <code name="code" class="python">[</code>LIMIT <i>start</i> <i>count</i><code name="code" class="python">]</code> <code name="code" class="python">[</code>GET <i>pattern</i><code name="code" class="python">]</code> <code name="code" class="python">[</code>ASC|DESC<code name="code" class="python">]</code> <code name="code" class="python">[</code>ALPHA<code name="code" class="python">]</code> =
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<blockquote>Sort the elements contained in the List or Set value at <i>key</i>. By defaultsorting is numeric with elements being compared as double precisionfloating point numbers. This is the simplest form of SORT.</blockquote>
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<pre class="codeblock python" name="code">
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SORT mylist
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</pre><blockquote>Assuming mylist contains a list of numbers, the return value will bethe list of numbers ordered from the smallest to the bigger number.In order to get the sorting in reverse order use DESC:</blockquote>
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<pre class="codeblock python python" name="code">
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SORT mylist DESC
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</pre><blockquote>ASC is also supported but it's the default so you don't really need it.If you want to sort lexicographically use ALPHA. Note that Redis isutf-8 aware assuming you set the right value for the LC_COLLATEenvironment variable.</blockquote>
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<blockquote>Sort is able to limit the number of results using the LIMIT option:</blockquote>
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<pre class="codeblock python python python" name="code">
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SORT mylist LIMIT 0 10
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</pre><blockquote>In the above example SORT will return only 10 elements, starting fromthe first one (star is zero-based). Almost all the sort options canbe mixed together. For example:</blockquote>
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<pre class="codeblock python python python python" name="code">
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SORT mylist LIMIT 0 10 ALPHA DESC
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</pre><blockquote>Will sort <i>mylist</i> lexicographically, in descending order, returning onlythe first 10 elements.</blockquote>
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<blockquote>Sometimes you want to sort elements using external keys as weights tocompare instead to compare the actual List or Set elements. For examplethe list <i>mylist</i> may contain the elements 1, 2, 3, 4, that are justthe unique IDs of objects stored at object_1, object_2, object_3and object_4, while the keys weight_1, weight_2, weight_3 and weight_4can contain weights we want to use to sort the list of objectsidentifiers. We can use the following command:</blockquote>
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<pre class="codeblock python python python python python" name="code">
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SORT mylist BY weight_*
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</pre><blockquote>the BY option takes a pattern (<code name="code" class="python">weight_*</code> in our example) that is usedin order to generate the key names of the weights used for sorting.Weight key names are obtained substituting the first occurrence of <code name="code" class="python">*</code>with the actual value of the elements on the list (1,2,3,4 in our example).</blockquote>
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<blockquote>Still our previous example will return just the sorted IDs. Often it isneeded to get the actual objects sorted (object_1, ..., object_4 in theexample). We can do it with the following command:</blockquote>
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<pre class="codeblock python python python python python python" name="code">
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SORT mylist BY weight_* GET object_*
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</pre><blockquote>Note that GET can be used multiple times in order to get more keys forevery element of the original List or Set sorted.</blockquote>
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<blockquote>Since Redis >= 1.1 it's possible to also GET the list elements itselfusing the special # pattern:</blockquote>
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<pre class="codeblock python python python python python python python" name="code">
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SORT mylist BY weight_* GET object_* GET #
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</pre><h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Multi bulk reply</a>, specifically a list of sorted elements.
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