{"id":2859,"date":"2026-05-06T16:59:46","date_gmt":"2026-05-06T08:59:46","guid":{"rendered":"https:\/\/tekno.bali-island.com\/?p=2859"},"modified":"2026-05-06T16:59:48","modified_gmt":"2026-05-06T08:59:48","slug":"clause-union-et-operateur-in-en-sql","status":"publish","type":"post","link":"https:\/\/tekno.bali-island.com\/fr\/articles\/clause-union-et-operateur-in-en-sql\/","title":{"rendered":"Clause UNION et op\u00e9rateur IN en SQL"},"content":{"rendered":"\n<p>Dans la gestion de bases de donn\u00e9es avec SQL, il existe diverses fonctions qui facilitent la manipulation et l&rsquo;extraction efficace des donn\u00e9es. Deux d&rsquo;entre elles, souvent sollicit\u00e9es par les d\u00e9veloppeurs et les analystes de donn\u00e9es, sont la clause UNION et l&rsquo;op\u00e9rateur IN. Voici un guide complet sur leurs fonctions, leurs conditions d&rsquo;utilisation et la mani\u00e8re d&rsquo;\u00e9crire leur syntaxe.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Clause UNION<\/strong><\/h2>\n\n\n\n<p>La clause&nbsp;<strong>UNION<\/strong>&nbsp;est une clause SQL utilis\u00e9e pour combiner deux ou plusieurs r\u00e9sultats d&rsquo;instructions SELECT.<\/p>\n\n\n\n<p>Pour utiliser cette clause, il ne suffit pas de combiner les tables au hasard. Des r\u00e8gles strictes doivent \u00eatre respect\u00e9es pour que la requ\u00eate ne produise pas d&rsquo;erreur :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chaque instruction SELECT combin\u00e9e doit avoir le\u00a0<strong>m\u00eame nombre de colonnes<\/strong>.<\/li>\n\n\n\n<li>Les types de donn\u00e9es des colonnes correspondantes doivent \u00eatre\u00a0<strong>identiques<\/strong>\u00a0ou compatibles.<\/li>\n\n\n\n<li>Les colonnes de chaque instruction SELECT doivent \u00eatre dans le\u00a0<strong>m\u00eame ordre<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Par d\u00e9faut, la clause UNION ne s\u00e9lectionne et n&rsquo;affiche que les valeurs distinctes. Cela signifie que le syst\u00e8me filtre automatiquement les r\u00e9sultats, de sorte qu&rsquo;<strong>aucune duplication de donn\u00e9es ne se produise<\/strong>.<\/p>\n\n\n\n<p><strong>Syntaxe d&rsquo;UNION :<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM table1<\/p>\n\n\n\n<p>UNION<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM table2;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Clause UNION ALL<\/strong><\/h2>\n\n\n\n<p>Dans la famille UNION, il existe \u00e9galement une variante de syntaxe appel\u00e9e&nbsp;<strong>UNION ALL<\/strong>.<\/p>\n\n\n\n<p>La principale diff\u00e9rence entre les deux r\u00e9side dans la mani\u00e8re dont le syst\u00e8me g\u00e8re les doublons. Si UNION supprime les doublons,&nbsp;<strong>UNION ALL autorise la duplication des donn\u00e9es<\/strong>. Cette clause affiche toutes les lignes de chaque instruction SELECT combin\u00e9e, qu&rsquo;il y ait ou non des valeurs exactement identiques.<\/p>\n\n\n\n<p><strong>Syntaxe d&rsquo;UNION ALL :<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM table1<\/p>\n\n\n\n<p>UNION ALL<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM table2;<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Remarque :<\/strong>&nbsp;L&rsquo;utilisation d&rsquo;UNION ALL est g\u00e9n\u00e9ralement plus rapide que celle d&rsquo;UNION simple, car le syst\u00e8me informatique n&rsquo;a pas besoin de consacrer du temps suppl\u00e9mentaire \u00e0 l&rsquo;analyse et \u00e0 la suppression des lignes en double.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Op\u00e9rateur IN<\/strong><\/h2>\n\n\n\n<p>L&rsquo;<strong>op\u00e9rateur IN<\/strong>&nbsp;est un op\u00e9rateur logique ajout\u00e9 \u00e0 la clause WHERE pour filtrer les donn\u00e9es en fonction de plusieurs valeurs possibles \u00e0 la fois.<\/p>\n\n\n\n<p>Cet op\u00e9rateur est souvent consid\u00e9r\u00e9 comme une m\u00e9thode&nbsp;<em>raccourcie<\/em>&nbsp;pour remplacer l&rsquo;utilisation r\u00e9p\u00e9t\u00e9e de l&rsquo;op\u00e9rateur OR lors d&rsquo;une s\u00e9lection sur plusieurs conditions. L&#8217;emploi de IN rend le code SQL beaucoup plus clair, concis et facile \u00e0 lire.<\/p>\n\n\n\n<p><strong>Syntaxe de l&rsquo;op\u00e9rateur IN (avec une liste de valeurs sp\u00e9cifiques) :<\/strong><\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM nom_table<\/p>\n\n\n\n<p>WHERE nom_colonne IN (valeur1, valeur2, &#8230;);<\/p>\n\n\n\n<p><strong>Syntaxe de l&rsquo;op\u00e9rateur IN (avec une sous-requ\u00eate \/ instruction SELECT) :<\/strong><br>En plus de d\u00e9finir les valeurs manuellement, vous pouvez \u00e9galement placer une autre instruction SELECT entre parenth\u00e8ses pour g\u00e9n\u00e9rer une liste de valeurs dynamiquement.<\/p>\n\n\n\n<p>SQL<\/p>\n\n\n\n<p>SELECT nom_colonne(s) FROM nom_table<\/p>\n\n\n\n<p>WHERE nom_colonne IN (INSTRUCTION_SELECT);<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans la gestion de bases de donn\u00e9es avec SQL, il existe diverses fonctions qui facilitent la manipulation et l&rsquo;extraction efficace des donn\u00e9es. Deux d&rsquo;entre elles, souvent sollicit\u00e9es par les d\u00e9veloppeurs et les analystes de donn\u00e9es, sont la clause UNION et l&rsquo;op\u00e9rateur IN. Voici un guide complet sur leurs fonctions, leurs conditions d&rsquo;utilisation et la mani\u00e8re d&rsquo;\u00e9crire leur syntaxe. Clause UNION La clause&nbsp;UNION&nbsp;est une clause SQL utilis\u00e9e pour combiner deux ou plusieurs r\u00e9sultats d&rsquo;instructions SELECT. Pour utiliser cette clause, il ne suffit pas de combiner les tables au hasard. Des r\u00e8gles strictes doivent \u00eatre respect\u00e9es pour que la requ\u00eate ne produise pas d&rsquo;erreur : Par d\u00e9faut, la clause UNION ne s\u00e9lectionne et n&rsquo;affiche que les valeurs distinctes. Cela signifie que le syst\u00e8me filtre automatiquement les r\u00e9sultats, de sorte qu&rsquo;aucune duplication de donn\u00e9es ne se produise. Syntaxe d&rsquo;UNION : SQL SELECT nom_colonne(s) FROM table1 UNION SELECT nom_colonne(s) FROM table2; Clause UNION ALL Dans la famille UNION, il existe \u00e9galement une variante de syntaxe appel\u00e9e&nbsp;UNION ALL. La principale diff\u00e9rence entre les deux r\u00e9side dans la mani\u00e8re dont le syst\u00e8me g\u00e8re les doublons. Si UNION supprime les doublons,&nbsp;UNION ALL autorise la duplication des donn\u00e9es. Cette clause affiche toutes les lignes de chaque instruction SELECT &hellip;<\/p>\n","protected":false},"author":1,"featured_media":2848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[95],"tags":[],"class_list":["post-2859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programmation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Clause UNION et op\u00e9rateur IN en SQL<\/title>\n<meta name=\"description\" content=\"Guide d&#039;utilisation des clauses UNION et UNION ALL pour combiner des donn\u00e9es, ainsi que des moyens efficaces d&#039;employer l&#039;op\u00e9rateur IN dans les requ\u00eates SQL\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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