[redis.git] / doc / SortCommand.html


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<b>SortCommand: Contents</b><br>&nbsp;&nbsp;<a href="#SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC|DESC ALPHA">SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC|DESC ALPHA</a><br>&nbsp;&nbsp;&nbsp;&nbsp;<a href="#Return value">Return value</a><br>&nbsp;&nbsp;&nbsp;&nbsp;<a href="#See Also">See Also</a>
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                <h1 class="wikiname">SortCommand</h1>

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                    <h1><a name="SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC|DESC ALPHA">SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC|DESC ALPHA</a></h1>
<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>
<pre class="codeblock python" name="code">
SORT mylist
</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>
<pre class="codeblock python python" name="code">
SORT mylist DESC
</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>
<blockquote>Sort is able to limit the number of results using the LIMIT option:</blockquote>
<pre class="codeblock python python python" name="code">
SORT mylist LIMIT 0 10
</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>
<pre class="codeblock python python python python" name="code">
SORT mylist LIMIT 0 10 ALPHA DESC
</pre><blockquote>Will sort <i>mylist</i> lexicographically, in descending order, returning onlythe first 10 elements.</blockquote>
<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>
<pre class="codeblock python python python python python" name="code">
SORT mylist BY weight_*
</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>
<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>
<pre class="codeblock python python python python python python" name="code">
SORT mylist BY weight_* GET object_*
</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>
<h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Multi bulk reply</a>, specifically a list of sorted elements.<h2><a name="See Also">See Also</a></h2>
<ul><li> <a href="SinterCommand.html">SINTER</a></li></ul>
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Commit	Line	Data
ed9b544e	1
	2	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
	3	<html>
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	5	<link type="text/css" rel="stylesheet" href="style.css" />
	6	</head>
	7	<body>
	8	<div id="page">
	9
	10	<div id='header'>
	11	<a href="index.html">
	12	<img style="border:none" alt="Redis Documentation" src="redis.png">
	13	</a>
	14	</div>
	15
	16	<div id="pagecontent">
	17	<div class="index">
	18	<!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. -->
	19	<b>SortCommand: Contents</b><br>  <a href="#SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC\|DESC ALPHA">SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC\|DESC ALPHA</a><br>    <a href="#Return value">Return value</a><br>    <a href="#See Also">See Also</a>
	20	</div>
	21
	22	<h1 class="wikiname">SortCommand</h1>
	23
	24	<div class="summary">
	25
	26	</div>
	27
	28	<div class="narrow">
	29	<h1><a name="SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC\|DESC ALPHA">SORT _key_ BY _pattern_ LIMIT _start_ _end_ GET _pattern_ ASC\|DESC ALPHA</a></h1>
	30	<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>
	31	<pre class="codeblock python" name="code">
	32	SORT mylist
	33	</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>
	34	<pre class="codeblock python python" name="code">
	35	SORT mylist DESC
	36	</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>
	37	<blockquote>Sort is able to limit the number of results using the LIMIT option:</blockquote>
	38	<pre class="codeblock python python python" name="code">
	39	SORT mylist LIMIT 0 10
	40	</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>
	41	<pre class="codeblock python python python python" name="code">
	42	SORT mylist LIMIT 0 10 ALPHA DESC
	43	</pre><blockquote>Will sort <i>mylist</i> lexicographically, in descending order, returning onlythe first 10 elements.</blockquote>
	44	<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>
	45	<pre class="codeblock python python python python python" name="code">
	46	SORT mylist BY weight_*
	47	</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>
	48	<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>
	49	<pre class="codeblock python python python python python python" name="code">
	50	SORT mylist BY weight_* GET object_*
	51	</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>
	52	<h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Multi bulk reply</a>, specifically a list of sorted elements.<h2><a name="See Also">See Also</a></h2>
	53	<ul><li> <a href="SinterCommand.html">SINTER</a></li></ul>
	54	</div>
	55
	56	</div>
	57	</div>
	58	</body>
	59	</html>
	60