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223 lines
7.3 KiB
HTML
223 lines
7.3 KiB
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<html lang="en" >
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<meta property="og:title" content="July, 2022" />
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<meta property="og:description" content="2022-07-02
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I learned how to use the Levenshtein functions in PostgreSQL
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The thing is that there is a limit of 255 characters for these functions in PostgreSQL so you need to truncate the strings before comparing
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Also, the trgm functions I’ve used before are case insensitive, but Levenshtein is not, so you need to make sure to lower case both strings first
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" />
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<meta property="og:type" content="article" />
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<meta property="og:url" content="https://alanorth.github.io/cgspace-notes/2022-07/" />
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<meta property="article:published_time" content="2022-07-02T14:07:36+03:00" />
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<meta property="article:modified_time" content="2022-07-02T14:07:36+03:00" />
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<meta name="twitter:card" content="summary"/>
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<meta name="twitter:title" content="July, 2022"/>
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<meta name="twitter:description" content="2022-07-02
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I learned how to use the Levenshtein functions in PostgreSQL
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The thing is that there is a limit of 255 characters for these functions in PostgreSQL so you need to truncate the strings before comparing
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Also, the trgm functions I’ve used before are case insensitive, but Levenshtein is not, so you need to make sure to lower case both strings first
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"/>
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<meta name="generator" content="Hugo 0.101.0" />
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<script type="application/ld+json">
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{
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"@context": "http://schema.org",
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"@type": "BlogPosting",
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"headline": "July, 2022",
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"url": "https://alanorth.github.io/cgspace-notes/2022-07/",
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"wordCount": "164",
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"datePublished": "2022-07-02T14:07:36+03:00",
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"dateModified": "2022-07-02T14:07:36+03:00",
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"author": {
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"@type": "Person",
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"name": "Alan Orth"
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},
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"keywords": "Notes"
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}
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</script>
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<link rel="canonical" href="https://alanorth.github.io/cgspace-notes/2022-07/">
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<title>July, 2022 | CGSpace Notes</title>
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<!-- combined, minified CSS -->
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<link href="https://alanorth.github.io/cgspace-notes/css/style.beb8012edc08ba10be012f079d618dc243812267efe62e11f22fe49618f976a4.css" rel="stylesheet" integrity="sha256-vrgBLtwIuhC+AS8HnWGNwkOBImfv5i4R8i/klhj5dqQ=" crossorigin="anonymous">
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<!-- minified Font Awesome for SVG icons -->
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<script defer src="https://alanorth.github.io/cgspace-notes/js/fontawesome.min.f5072c55a0721857184db93a50561d7dc13975b4de2e19db7f81eb5f3fa57270.js" integrity="sha256-9QcsVaByGFcYTbk6UFYdfcE5dbTeLhnbf4HrXz+lcnA=" crossorigin="anonymous"></script>
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<div class="blog-masthead">
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<div class="container">
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<nav class="nav blog-nav">
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<a class="nav-link " href="https://alanorth.github.io/cgspace-notes/">Home</a>
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</nav>
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<header class="blog-header">
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<div class="container">
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<h1 class="blog-title" dir="auto"><a href="https://alanorth.github.io/cgspace-notes/" rel="home">CGSpace Notes</a></h1>
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<p class="lead blog-description" dir="auto">Documenting day-to-day work on the <a href="https://cgspace.cgiar.org">CGSpace</a> repository.</p>
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</div>
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</header>
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<div class="container">
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<div class="row">
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<div class="col-sm-8 blog-main">
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<article class="blog-post">
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<header>
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<h2 class="blog-post-title" dir="auto"><a href="https://alanorth.github.io/cgspace-notes/2022-07/">July, 2022</a></h2>
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<p class="blog-post-meta">
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<time datetime="2022-07-02T14:07:36+03:00">Sat Jul 02, 2022</time>
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in
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<span class="fas fa-folder" aria-hidden="true"></span> <a href="/categories/notes/" rel="category tag">Notes</a>
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</p>
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</header>
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<h2 id="2022-07-02">2022-07-02</h2>
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<ul>
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<li>I learned how to use the Levenshtein functions in PostgreSQL
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<ul>
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<li>The thing is that there is a limit of 255 characters for these functions in PostgreSQL so you need to truncate the strings before comparing</li>
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<li>Also, the trgm functions I’ve used before are case insensitive, but Levenshtein is not, so you need to make sure to lower case both strings first</li>
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</ul>
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</li>
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</ul>
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<ul>
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<li>A working query checking for duplicates in the recent AfricaRice items is:</li>
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</ul>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>localhost/dspace= ☘ SELECT text_value FROM metadatavalue WHERE dspace_object_id IN (SELECT uuid FROM item) AND metadata_field_id=64 AND levenshtein_less_equal(LOWER('International Trade and Exotic Pests: The Risks for Biodiversity and African Economies'), LEFT(LOWER(text_value), 255), 3) <= 3;
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</span></span><span style="display:flex;"><span> text_value
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</span></span><span style="display:flex;"><span>────────────────────────────────────────────────────────────────────────────────────────
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</span></span><span style="display:flex;"><span> International trade and exotic pests: the risks for biodiversity and African economies
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</span></span><span style="display:flex;"><span>(1 row)
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</span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010"></span>Time: 399.751 ms
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</span></span></code></pre></div><ul>
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<li>There is a great <a href="https://www.crunchydata.com/blog/fuzzy-name-matching-in-postgresql">blog post discussing Soundex with Levenshtein</a> and creating indexes to make them faster</li>
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<li>I want to do some proper checks of accuracy and speed against my trigram method</li>
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</ul>
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<h2 id="2022-07-03">2022-07-03</h2>
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<ul>
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<li>Start a harvest on AReS</li>
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</ul>
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<!-- raw HTML omitted -->
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</article>
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</div> <!-- /.blog-main -->
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<aside class="col-sm-3 ml-auto blog-sidebar">
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<section class="sidebar-module">
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<h4>Recent Posts</h4>
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<ol class="list-unstyled">
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<li><a href="/cgspace-notes/2022-07/">July, 2022</a></li>
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<li><a href="/cgspace-notes/2022-06/">June, 2022</a></li>
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<li><a href="/cgspace-notes/2022-05/">May, 2022</a></li>
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<li><a href="/cgspace-notes/2022-04/">April, 2022</a></li>
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<li><a href="/cgspace-notes/2022-03/">March, 2022</a></li>
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</ol>
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</section>
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<section class="sidebar-module">
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<h4>Links</h4>
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<ol class="list-unstyled">
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<li><a href="https://cgspace.cgiar.org">CGSpace</a></li>
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<li><a href="https://dspacetest.cgiar.org">DSpace Test</a></li>
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<li><a href="https://github.com/ilri/DSpace">CGSpace @ GitHub</a></li>
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</ol>
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</section>
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</aside>
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</div> <!-- /.row -->
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</div> <!-- /.container -->
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<footer class="blog-footer">
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<p dir="auto">
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Blog template created by <a href="https://twitter.com/mdo">@mdo</a>, ported to Hugo by <a href='https://twitter.com/mralanorth'>@mralanorth</a>.
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</p>
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<p>
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<a href="#">Back to top</a>
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</p>
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</footer>
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</body>
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</html>
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