{"id":2950,"date":"2026-05-07T11:14:03","date_gmt":"2026-05-07T03:14:03","guid":{"rendered":"https:\/\/tekno.bali-island.com\/?p=2950"},"modified":"2026-05-07T11:14:04","modified_gmt":"2026-05-07T03:14:04","slug":"fonctions-dagregation-et-regroupement-de-donnees-en-sql","status":"publish","type":"post","link":"https:\/\/tekno.bali-island.com\/fr\/articles\/fonctions-dagregation-et-regroupement-de-donnees-en-sql\/","title":{"rendered":"Fonctions d&rsquo;Agr\u00e9gation et Regroupement de Donn\u00e9es en SQL"},"content":{"rendered":"\n<p>Les fonctions d&rsquo;agr\u00e9gation sont des sous-programmes en SQL qui produisent une valeur unique lorsqu&rsquo;ils sont appel\u00e9s. Ces fonctions sont utilis\u00e9es pour effectuer des calculs statistiques standard sur des attributs ou des champs d&rsquo;une table, tels que le calcul de totaux, de moyennes, la recherche de valeurs extr\u00eames (les plus petites et les plus grandes) et le comptage du nombre d&rsquo;enregistrements de donn\u00e9es.<\/p>\n\n\n\n<p>En termes simples, les fonctions d&rsquo;agr\u00e9gation traitent de nombreuses lignes de donn\u00e9es pour produire une seule valeur de sortie concise et informative.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Types de Fonctions d&rsquo;Agr\u00e9gation<\/strong><\/h2>\n\n\n\n<p>Il existe cinq principales fonctions d&rsquo;agr\u00e9gation couramment utilis\u00e9es dans le traitement des donn\u00e9es:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SUM<\/strong>\u00a0Cette fonction est utilis\u00e9e pour additionner toutes les donn\u00e9es d&rsquo;une colonne sp\u00e9cifique. Il est \u00e0 noter que la fonction SUM ne peut \u00eatre appliqu\u00e9e qu&rsquo;aux colonnes de type num\u00e9rique.\u00a0<strong>Syntaxe:<\/strong>\u00a0SELECT SUM(nom_colonne) FROM nom_table WHERE condition;<\/li>\n\n\n\n<li><strong>COUNT<\/strong>\u00a0Cette fonction est utilis\u00e9e pour compter le nombre de lignes pr\u00e9sentes dans une colonne. Contrairement \u00e0 SUM, la fonction COUNT fonctionne sur les types de donn\u00e9es num\u00e9riques et non num\u00e9riques (cha\u00eenes\/texte).\u00a0<strong>Syntaxe:<\/strong>\u00a0SELECT COUNT(nom_colonne) FROM nom_table WHERE condition;<\/li>\n\n\n\n<li><strong>AVG (Average)<\/strong>\u00a0Cette fonction est utilis\u00e9e pour trouver la valeur moyenne d&rsquo;une colonne. Comme SUM, cette fonction ne fonctionne que sur les types de donn\u00e9es num\u00e9riques.\u00a0<strong>Syntaxe:<\/strong>\u00a0SELECT AVG(nom_colonne) FROM nom_table WHERE condition;<\/li>\n\n\n\n<li><strong>MIN<\/strong>\u00a0Cette fonction est utilis\u00e9e pour afficher la plus petite valeur d&rsquo;une colonne. La fonction MIN est flexible car elle peut fonctionner sur les types de donn\u00e9es num\u00e9riques et non num\u00e9riques.\u00a0<strong>Syntaxe:<\/strong>\u00a0SELECT MIN(nom_colonne) FROM nom_table WHERE condition;<\/li>\n\n\n\n<li><strong>MAX<\/strong>\u00a0\u00c0 l&rsquo;oppos\u00e9 de MIN, cette fonction est utilis\u00e9e pour afficher la plus grande valeur d&rsquo;une colonne. Cette fonction prend \u00e9galement en charge les types de donn\u00e9es num\u00e9riques et non num\u00e9riques.\u00a0<strong>Syntaxe:<\/strong>\u00a0SELECT MAX(nom_colonne) FROM nom_table WHERE condition;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Clause GROUP BY<\/strong><\/h2>\n\n\n\n<p>La clause&nbsp;<strong>GROUP BY<\/strong>&nbsp;est utilis\u00e9e pour regrouper les donn\u00e9es d&rsquo;une ou plusieurs colonnes selon une expression souhait\u00e9e. Elle fonctionne en rassemblant les enregistrements de donn\u00e9es ayant la m\u00eame valeur dans un m\u00eame groupe.<\/p>\n\n\n\n<p>L&rsquo;utilisation de cette clause est \u00e9troitement li\u00e9e aux fonctions d&rsquo;agr\u00e9gation, car on souhaite souvent obtenir des r\u00e9sultats statistiques (tels que des totaux ou des moyennes) pour chaque cat\u00e9gorie sp\u00e9cifique.&nbsp;<strong>Syntaxe:<\/strong>&nbsp;SELECT nom_colonne FROM nom_table GROUP BY nom_colonne;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Clause HAVING<\/strong><\/h2>\n\n\n\n<p>La clause&nbsp;<strong>HAVING<\/strong>&nbsp;a une fonction similaire \u00e0 celle de la clause&nbsp;<strong>WHERE<\/strong>, c&rsquo;est-\u00e0-dire ajouter des conditions ou des filtres aux r\u00e9sultats de la requ\u00eate. Il existe cependant des diff\u00e9rences fondamentales entre les deux:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Remplacement de WHERE:<\/strong>\u00a0La clause WHERE ne peut pas \u00eatre utilis\u00e9e conjointement avec des fonctions d&rsquo;agr\u00e9gation. C&rsquo;est pourquoi HAVING est utilis\u00e9e pour filtrer les donn\u00e9es en fonction des r\u00e9sultats de ces fonctions d&rsquo;agr\u00e9gation.<\/li>\n\n\n\n<li><strong>Op\u00e9ration multi-lignes:<\/strong>\u00a0HAVING est utilis\u00e9e pour les op\u00e9rations multi-lignes (apr\u00e8s le regroupement des donn\u00e9es), tandis que WHERE agit au niveau de chaque ligne avant le regroupement.<\/li>\n<\/ol>\n\n\n\n<p><strong>Syntaxe:<\/strong>&nbsp;SELECT nom_colonne FROM nom_table GROUP BY nom_colonne HAVING condition;<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les fonctions d&rsquo;agr\u00e9gation sont des sous-programmes en SQL qui produisent une valeur unique lorsqu&rsquo;ils sont appel\u00e9s. Ces fonctions sont utilis\u00e9es pour effectuer des calculs statistiques standard sur des attributs ou des champs d&rsquo;une table, tels que le calcul de totaux, de moyennes, la recherche de valeurs extr\u00eames (les plus petites et les plus grandes) et le comptage du nombre d&rsquo;enregistrements de donn\u00e9es. En termes simples, les fonctions d&rsquo;agr\u00e9gation traitent de nombreuses lignes de donn\u00e9es pour produire une seule valeur de sortie concise et informative. 1. Types de Fonctions d&rsquo;Agr\u00e9gation Il existe cinq principales fonctions d&rsquo;agr\u00e9gation couramment utilis\u00e9es dans le traitement des donn\u00e9es: 2. Clause GROUP BY La clause&nbsp;GROUP BY&nbsp;est utilis\u00e9e pour regrouper les donn\u00e9es d&rsquo;une ou plusieurs colonnes selon une expression souhait\u00e9e. Elle fonctionne en rassemblant les enregistrements de donn\u00e9es ayant la m\u00eame valeur dans un m\u00eame groupe. L&rsquo;utilisation de cette clause est \u00e9troitement li\u00e9e aux fonctions d&rsquo;agr\u00e9gation, car on souhaite souvent obtenir des r\u00e9sultats statistiques (tels que des totaux ou des moyennes) pour chaque cat\u00e9gorie sp\u00e9cifique.&nbsp;Syntaxe:&nbsp;SELECT nom_colonne FROM nom_table GROUP BY nom_colonne; 3. Clause HAVING La clause&nbsp;HAVING&nbsp;a une fonction similaire \u00e0 celle de la clause&nbsp;WHERE, c&rsquo;est-\u00e0-dire ajouter des conditions ou des filtres aux r\u00e9sultats de la requ\u00eate. Il existe &hellip;<\/p>\n","protected":false},"author":1,"featured_media":2939,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[95],"tags":[],"class_list":["post-2950","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>Fonctions d&#039;Agr\u00e9gation et Regroupement de Donn\u00e9es en SQL<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez la d\u00e9finition des fonctions d&#039;agr\u00e9gation en SQL, leurs types, ainsi que des tutoriels sur l&#039;utilisation des clauses GROUP BY et HAVING.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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