[Solved] xquery for grouping data from xml file on xml, xquery, basex

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</script> </div> <div class="col-md-8" itemscope="itemscope" itemtype="http://schema.org/QAPage"> <div class="wrapperLayout" itemprop="mainEntity" itemscope="" itemtype="http://schema.org/Question"> <link itemprop="image" href="https://techqa.club/img/logo-default.png"> <div class="box question"> <div class="box-header with-border"> <h1 itemprop="name"> <a href=""> xquery for grouping data from xml file </a> </h1> <span class="text-muted text-date"> <span class="views">306 views</span> Asked by <span itemprop="author" itemscope itemtype="http://schema.org/Person"> <span itemprop="name"> <strong>star2014</strong> </span> </span> At <time class="d-none" datetime="2013-12-03T20:16:23+00:00" itemprop="datePublished" title="2013-12-03T20:16:23+00:00"> 2013-12-03T20:16:23+00:00 </time> <time datetime="2013-12-03T20:16:23.823000" title="2013-12-03T20:16:23+00:00"> 03 December 2013 at 20:16 </time> <time class="d-none" itemprop="dateModified" title="2025-12-18T12:55:34+00:00"> 2025-12-18T12:55:34+00:00 </time> </span> </div> <div class="box-body"> <div itemprop="text" class="post-text"> <p>I am trying to run an xquery for my xml file. This is my input xml file:</p> <pre><code><?xml version="1.0" ?> <authors> <author><name> Steven</name> <title>advanced</title> <title>TCPIP</title> </author> <author><name> George</name> <title>DataMining</title> <title>Economic</title> </author> <author><name> Den</name> <title>TCPIP</title> <title>Economic</title> </author> </authors> </code></pre> <p>I am trying to group each title and count the number of authors for each title. Books should be listed in increasing order of number of authors. For each book, output its title, the number of authors and the name of all its authors in alphabetic order. Finally, the output should be like this:</p> <pre><code><bib> <book authors="1"> <title>Advanced</title> <author>Steven</authhor> </book> <book authors="1"> <title>DataMining</title> <author>George</author> </book> <book authors="2"> <title>TCPIP</title> <author>Den</author> <author>Steven</author> </book> <book authors="2"> <title>Economic</title> <author>Den</author> <author>George</author> </book> </bib> </code></pre> <p>This is my code which doesn't work :(. is there any help. please if it is possible correct my code instead of writing a new code, because i want the answer be look like to my answer.</p> <pre><code><bib> {for $a in doc('test')//authors let $T:={for $c in doc ('test')//authors/author[title=$a/author/title] order by count($T) return <book authors="{count($T)}"> {<title> {distinct-values($T/title)} for $x in $T order by $x/name() return <author>{$x/name()}</author>} </book>} </bib> </code></pre> <p>I think the problem is for the part that I try to use the <code>let</code> command. As I know I can group data by let command. I tried for each title in XML file to grab all authors and after that count the number of authors and sort them by name. I use this link: <a href="http://basex.org/products/live-demo/" rel="nofollow">http://basex.org/products/live-demo/</a> to test my answer.</p> </div> <div class="tagcloud"> <a href="https://techqa.club/q/t/xml"> <span>xml</span> </a> <a href="https://techqa.club/q/t/xquery"> <span>xquery</span> </a> <a href="https://techqa.club/q/t/basex"> <span>basex</span> </a> </div> </div> <div class="box-footer"> <span class="source"> <a href="https://stackoverflow.com/questions/20360799/xquery-for-grouping-data-from-xml-file" target="_blank" rel="nofollow"> Original Q&A </a> </span> </div> </div> <div class="ikanPalsu"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-2199440138602787" data-ad-slot="9990002217" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <div class="counter-header my-3"> <span class="d-none" itemprop="answerCount">1</span> <h2>There are 1 answers</h2> </div> <div class="box answerQuestion"> <div id="wajab" class="box"> <div class="box"> <div class="post answerId-669fe52ea06677a8f27ced50 accepted" id="answer-669fe52ea06677a8f27ced50" class="box" data-answerid="669fe52ea06677a8f27ced50" itemprop="acceptedAnswer" itemscope="" itemtype="http://schema.org/Answer"> <a class="d-none" itemprop="url" href="#answer-669fe52ea06677a8f27ced50"></a> <div class="vote-count d-none" itemprop="upvoteCount" data-value="2">2</div> <div class="box-header"> <span class="username"> <img src="/img/user-default.png" onerror="this.src='/img/user-default.png';" class="answerAva" alt="dirkk" > <span itemprop="author" itemscope="" itemtype="http://schema.org/Person"> <span itemprop="name" class="author-name"> <strong>dirkk</strong> </span> </span> <span title="2013-12-04T11:17:55.070000" class="dater d-none d-md-inline-block"> On <time class="d-none" itemprop="datePublished" title="2013-12-04T11:17:55+00:00" datetime="2013-12-04T11:17:55+00:00"> 2013-12-04T11:17:55+00:00 </time> <time title="2013-12-04T11:17:55.070000" datetime="2013-12-04T11:17:55.070000"> 04 December 2013 at 11:17 </time> </span> <span class="badge badge-danger"> BEST ANSWER </span> </span> </div> <div class="box-comment box-body"> <div class="comment-text"> <div class="" itemprop="text"> <p>As Daniel Haley suggested, you should do it the other way round, i.e. iterating over each title and looking for the authors which write this specific title. You can use <code>distinct-values</code> or <code>group by</code>. The following should work:</p> <pre><code><bib> { let $titles := distinct-values(doc('test')//title) for $t in $titles let $authors := doc('test')//author[title = $t] order by count($authors) return <book authors="{count($authors)}"> <title>{$t}</title> { for $a in $authors order by $a/name return <author>{$a/name/string()}</author> } </book> } </bib> </code></pre> </div> </div> </div> </div> </div> </div> </div> </div> <div class="widget bottom-rel"> <div class="widget-title"> <h3>Related Questions in <strong>XML</strong></h3> </div> <ul id="relatedBottom" class="relatedPost postbottom"> <li> <a href='https://techqa.club/v/q/impose-component-restriction-to-a-series-of-parsys-cq-30658733'> Impose component restriction to a series of parsys-CQ </a> </li> <li> <a href='https://techqa.club/v/q/wrong-xml-being-inflated-android-30662023'> Wrong xml being inflated android </a> </li> <li> <a href='https://techqa.club/v/q/shorten-the-xsd-30659459'> Shorten the XSD </a> </li> <li> <a href='https://techqa.club/v/q/writing-overwriting-to-specific-xml-file-from-asp-net-code-behind-30709850'> Writing/Overwriting to specific XML file from ASP.NET code behind </a> </li> <li> <a href='https://techqa.club/v/q/magento-custom-block-can-t-get-block-s-file-30688893'> Magento custom block. 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