Merge branch 'main' of https://github.com/a-lambda/a-lambda.github.io

_quarto.yml

@@ -27,7 +27,7 @@ format:
         - slate
         - dark.css
     code-link: true
-    code-fold: true
+    #code-fold: true
     #mainfont: verdana
     fontsize: 1.25rem
     monofont: Fira Code

docs/CNAME

@@ -0,0 +1 @@
+www.chapelier-fou.fr

docs/animate_plot.html

@@ -159,13 +159,13 @@ <h1 class="title">Animate plots</h1>
 
 </header><section id="exemple-danimation" class="level3"><h3 class="anchored" data-anchor-id="exemple-danimation">1. Exemple d’animation</h3>
 <div class="cell">
-<details><summary>Code</summary><div class="sourceCode" id="cb1"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">ggplot</span><span class="op">(</span><span class="va">mpg</span><span class="op">)</span> <span class="op">+</span></span>
+<div class="sourceCode" id="cb1"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">ggplot</span><span class="op">(</span><span class="va">mpg</span><span class="op">)</span> <span class="op">+</span></span>
 <span>  <span class="fu">geom_bar</span><span class="op">(</span><span class="fu">aes</span><span class="op">(</span>x <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/factor.html">factor</a></span><span class="op">(</span><span class="va">cyl</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op">+</span></span>
 <span>  <span class="fu">labs</span><span class="op">(</span>title <span class="op">=</span> <span class="st">'Number of cars in {closest_state} by number of cylinders'</span><span class="op">)</span> <span class="op">+</span></span>
 <span>  <span class="fu">transition_states</span><span class="op">(</span>states <span class="op">=</span> <span class="va">year</span><span class="op">)</span> <span class="op">+</span></span>
 <span>  <span class="fu">enter_grow</span><span class="op">(</span><span class="op">)</span> <span class="op">+</span></span>
 <span> <span class="fu">exit_fade</span><span class="op">(</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
-</details><div class="cell-output-display">
+<div class="cell-output-display">
 <p><img src="animate_plot_files/figure-html/geombar-animate-1.gif" class="img-fluid"></p>
 </div>
 </div>

docs/index.html

@@ -160,14 +160,14 @@ <h1 class="title">The chance</h1>
   <div class="about-contents"><div id="ppc">
 <p>Is your world choosing the same numbers as mine ?</p>
 <div class="cell">
-<details><summary>Code</summary><div class="sourceCode" id="cb1"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">roll</span> <span class="op">&lt;-</span> </span>
+<div class="sourceCode" id="cb1"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">roll</span> <span class="op">&lt;-</span> </span>
 <span>  <span class="fu"><a href="https://rdrr.io/r/base/sample.html">sample.int</a></span><span class="op">(</span>n <span class="op">=</span> <span class="fl">6</span>, size <span class="op">=</span> <span class="fl">42</span>, replace <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
 <span></span>
 <span><span class="fu"><a href="https://rdrr.io/r/base/table.html">table</a></span><span class="op">(</span><span class="va">roll</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
-</details><div class="cell-output cell-output-stdout">
+<div class="cell-output cell-output-stdout">
 <pre><code>roll
  1  2  3  4  5  6 
- 9  7 12  3  8  3 </code></pre>
+ 6 13 12  5  3  3 </code></pre>
 </div>
 </div>
 <p>How many trials before getting an identical world ?</p>

docs/sql.html

@@ -17,6 +17,40 @@
   margin: 0 0.8em 0.2em -1em; /* quarto-specific, see https://github.com/quarto-dev/quarto-cli/issues/4556 */ 
   vertical-align: middle;
 }
+/* CSS for syntax highlighting */
+pre > code.sourceCode { white-space: pre; position: relative; }
+pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
+pre > code.sourceCode > span:empty { height: 1.2em; }
+.sourceCode { overflow: visible; }
+code.sourceCode > span { color: inherit; text-decoration: inherit; }
+div.sourceCode { margin: 1em 0; }
+pre.sourceCode { margin: 0; }
+@media screen {
+div.sourceCode { overflow: auto; }
+}
+@media print {
+pre > code.sourceCode { white-space: pre-wrap; }
+pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
+}
+pre.numberSource code
+  { counter-reset: source-line 0; }
+pre.numberSource code > span
+  { position: relative; left: -4em; counter-increment: source-line; }
+pre.numberSource code > span > a:first-child::before
+  { content: counter(source-line);
+    position: relative; left: -1em; text-align: right; vertical-align: baseline;
+    border: none; display: inline-block;
+    -webkit-touch-callout: none; -webkit-user-select: none;
+    -khtml-user-select: none; -moz-user-select: none;
+    -ms-user-select: none; user-select: none;
+    padding: 0 4px; width: 4em;
+  }
+pre.numberSource { margin-left: 3em;  padding-left: 4px; }
+div.sourceCode
+  {   }
+@media screen {
+pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
+}
 </style>
 
 <script src="site_libs/quarto-nav/quarto-nav.js"></script>
@@ -105,7 +139,9 @@
         <nav id="TOC" role="doc-toc" class="toc-active"><h2 id="toc-title">On this page</h2>
 
   <ul>
-<li><a href="#postgresql-interesting-commands" id="toc-postgresql-interesting-commands" class="nav-link active" data-scroll-target="#postgresql-interesting-commands">1. PostgreSQL interesting commands</a></li>
+<li><a href="#comment-supprimer-les-doublons-dune-table" id="toc-comment-supprimer-les-doublons-dune-table" class="nav-link active" data-scroll-target="#comment-supprimer-les-doublons-dune-table">1. Comment supprimer les doublons d’une table</a></li>
+  <li><a href="#postgresql-interesting-commands" id="toc-postgresql-interesting-commands" class="nav-link" data-scroll-target="#postgresql-interesting-commands">2. PostgreSQL interesting commands</a></li>
+  <li><a href="#section" id="toc-section" class="nav-link" data-scroll-target="#section"></a></li>
   </ul></nav>
     </div>
 <!-- main -->
@@ -123,14 +159,99 @@ <h1 class="title">SQL</h1>
   </div>
 
 
-</header><section id="postgresql-interesting-commands" class="level3"><h3 class="anchored" data-anchor-id="postgresql-interesting-commands">1. PostgreSQL interesting commands</h3>
+</header><section id="comment-supprimer-les-doublons-dune-table" class="level2"><h2 class="anchored" data-anchor-id="comment-supprimer-les-doublons-dune-table">1. Comment supprimer les doublons d’une table</h2>
+<p>La table prise pour exemple sera la table elu composées des champs suivants :</p>
+<ul>
+<li>elu_id (primary key)</li>
+<li>elu_nom</li>
+<li>elu_prenom</li>
+<li>elu_date_naissance</li>
+<li>elu_lieu_naissance</li>
+<li>elu_genre</li>
+</ul>
+<p>Nous pouvons identifier les doublons comme suit :</p>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="kw">SELECT</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre, <span class="fu">COUNT</span>(<span class="op">*</span>) <span class="kw">FROM</span> elu </span>
+<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="kw">GROUP</span> <span class="kw">BY</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre </span>
+<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="kw">HAVING</span> <span class="fu">COUNT</span>(<span class="op">*</span>) <span class="op">&gt;</span> <span class="dv">1</span>; </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<p>3 méthodes possibles pour supprimer les doublons :</p>
+<ol type="1">
+<li>suppression depuis un INNER JOIN (USING avec postgresql)</li>
+</ol>
+<p>Cette méthode ne marche pas s’il n’existe pas d’index (comme elu_id ici)</p>
+<ol start="2" type="1">
+<li>La deuxième méthode consiste à</li>
+</ol>
+<ul>
+<li>recréer une table identique</li>
+</ul>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">CREATE</span> <span class="kw">TABLE</span> <span class="cf">IF</span> <span class="kw">NOT</span> <span class="kw">EXISTS</span> new_elu (</span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  elu_id SERIAL <span class="kw">PRIMARY</span> <span class="kw">KEY</span>,</span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>  elu_nom <span class="dt">VARCHAR</span>(<span class="dv">50</span>) <span class="kw">NOT</span> <span class="kw">NULL</span>,</span>
+<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a>  elu_prenom <span class="dt">VARCHAR</span>(<span class="dv">50</span>) <span class="kw">NOT</span> <span class="kw">NULL</span>,</span>
+<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a>  elu_date_naissance <span class="dt">DATE</span> <span class="kw">NOT</span> <span class="kw">NULL</span>,</span>
+<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a>  elu_lieu_naissance <span class="dt">VARCHAR</span>(<span class="dv">50</span>),</span>
+<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a>  elu_genre genre <span class="kw">NOT</span> <span class="kw">NULL</span></span>
+<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a>  );</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<ul>
+<li>copier une version unique de chaque enregistrement</li>
+</ul>
+<ol type="a">
+<li>première méthode</li>
+</ol>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="kw">INSERT</span> <span class="kw">INTO</span> new_elu (elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre)</span>
+<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="kw">SELECT</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre </span>
+<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="kw">FROM</span> elu </span>
+<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="kw">GROUP</span> <span class="kw">BY</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre;</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<ol start="2" type="a">
+<li>deuxième méthode avec DISTINCT</li>
+</ol>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="kw">INSERT</span> <span class="kw">INTO</span> new_elu (elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre)</span>
+<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="kw">SELECT</span> <span class="kw">DISTINCT</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre</span>
+<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="kw">FROM</span> elu;</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<ul>
+<li>supprimer la table initiale</li>
+</ul>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb5"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="kw">DROP</span> <span class="kw">table</span> elu;</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<ul>
+<li>renommer la copie</li>
+</ul>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb6"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="kw">ALTER</span> <span class="kw">table</span> new_elu</span>
+<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="kw">RENAME</span> <span class="kw">TO</span> elu;</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+<ol start="3" type="1">
+<li>la methode consiste à utiliser la fonction ROW_NUMBER()</li>
+</ol>
+<div class="cell">
+<div class="sourceCode cell-code" id="cb7"><pre class="sourceCode sql code-with-copy"><code class="sourceCode sql"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="kw">DELETE</span> <span class="kw">FROM</span> elu</span>
+<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="kw">WHERE</span> elu_id <span class="kw">IN</span> (</span>
+<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a>  <span class="kw">SELECT</span> elu_id</span>
+<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a>  <span class="kw">FROM</span> (</span>
+<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a>    <span class="kw">SELECT</span> elu_id,</span>
+<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a>    <span class="fu">ROW_NUMBER</span>() <span class="kw">OVER</span>(<span class="kw">PARTITION</span> <span class="kw">BY</span> elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre) <span class="kw">AS</span> <span class="kw">rownum</span></span>
+<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a>    <span class="kw">FROM</span> elu</span>
+<span id="cb7-8"><a href="#cb7-8" aria-hidden="true" tabindex="-1"></a>  ) <span class="kw">AS</span> sub</span>
+<span id="cb7-9"><a href="#cb7-9" aria-hidden="true" tabindex="-1"></a>  <span class="kw">WHERE</span> <span class="kw">rownum</span> <span class="op">&gt;</span> <span class="dv">1</span></span>
+<span id="cb7-10"><a href="#cb7-10" aria-hidden="true" tabindex="-1"></a>);</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
+</section><section id="postgresql-interesting-commands" class="level2"><h2 class="anchored" data-anchor-id="postgresql-interesting-commands">2. PostgreSQL interesting commands</h2>
 <ul>
 <li><p>REASSIGN OWNED BY &lt;old_role&gt; to &lt;new_role&gt;;</p></li>
 <li><p>REVOKE ALL PRIVILEGES ON DATABASE &lt;database&gt; FROM &lt;role&gt;;</p></li>
-</ul>
+</ul></section><section id="section" class="level2"><h2 class="anchored" data-anchor-id="section"></h2>
 <div class="cell">
 <div class="cell-output cell-output-stdout">
-<pre><code>[1] "elu"   "csp"   "ou594"</code></pre>
+<pre><code>[1] "elu"   "ou594"</code></pre>
 </div>
 <div class="cell-output cell-output-stdout">
 <pre><code>   elu_genre       elu_nom     elu_prenom elu_lieu_naissance

sql.qmd

@@ -2,12 +2,117 @@
 title: "SQL"
 ---
 
-### 1. PostgreSQL interesting commands
+## 1. Comment supprimer les doublons d'une table
+
+La table prise pour exemple sera la table elu composées des champs suivants :
+
+- elu_id (primary key)
+- elu_nom
+- elu_prenom
+- elu_date_naissance
+- elu_lieu_naissance
+- elu_genre
+
+Nous pouvons identifier les doublons comme suit :
+
+```{SQL}
+SELECT elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre, COUNT(*) FROM elu 
+GROUP BY elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre 
+HAVING COUNT(*) > 1; 
+```
+3 méthodes possibles pour supprimer les doublons :
+
+1. suppression depuis un INNER JOIN (USING avec postgresql)
+
+```{SQL}
+#| echo: false
+# Cette méthode ne fonctionne pas ici 
+DELETE FROM elu e1
+USING elu e2
+WHERE e1.elu_nom = e2.elu_nom
+  AND e1.elu_prenom = e2.elu_prenom
+  AND e1.elu_date_naissance = e2.elu_date_naissance
+  AND e1.elu_lieu_naissance = e2.elu_lieu_naissance
+  AND e1.elu_genre = e2.elu_genre 
+  AND e1.elu_id < e2.elu_id;
+```
+Cette méthode ne marche pas s'il n'existe pas d'index (comme elu_id ici)
+
+2. La deuxième méthode consiste à 
+
+- recréer une table identique
+
+```{SQL}
+CREATE TABLE IF NOT EXISTS new_elu (
+  elu_id SERIAL PRIMARY KEY,
+  elu_nom VARCHAR(50) NOT NULL,
+  elu_prenom VARCHAR(50) NOT NULL,
+  elu_date_naissance DATE NOT NULL,
+  elu_lieu_naissance VARCHAR(50),
+  elu_genre genre NOT NULL
+  );
+```
+- copier une version unique de chaque enregistrement
+
+a. première méthode
+
+```{SQL}
+INSERT INTO new_elu (elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre)
+SELECT elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre 
+FROM elu 
+GROUP BY elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre;
+```
+b. deuxième méthode avec DISTINCT
+
+```{SQL}
+INSERT INTO new_elu (elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre)
+SELECT DISTINCT elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre
+FROM elu;
+```
+
+- supprimer la table initiale
+
+```{SQL}
+DROP table elu;
+```
+
+- renommer la copie
+
+```{SQL}
+ALTER table new_elu
+RENAME TO elu;
+```
+
+3. la methode consiste à utiliser la fonction ROW_NUMBER()
+
+```{SQL}
+DELETE FROM elu
+WHERE elu_id IN (
+  SELECT elu_id
+  FROM (
+    SELECT elu_id,
+    ROW_NUMBER() OVER(PARTITION BY elu_nom, elu_prenom, elu_date_naissance, elu_lieu_naissance, elu_genre) AS rownum
+    FROM elu
+  ) AS sub
+  WHERE rownum > 1
+);
+```
+
+
+
+
+
+
+
+## 2. PostgreSQL interesting commands
 
 - REASSIGN OWNED BY \<old_role\> to \<new_role\>;
 
 - REVOKE ALL PRIVILEGES ON DATABASE \<database\> FROM \<role\>;
 
+##
+
+
 ```{r}
 #| label: load-ggplot
 #| echo: false