{"id":2393,"date":"2023-07-22T11:32:40","date_gmt":"2023-07-22T11:32:40","guid":{"rendered":"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/"},"modified":"2023-07-22T11:32:40","modified_gmt":"2023-07-22T11:32:40","slug":"gruppo-mongodb-per-numero","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/","title":{"rendered":"Mongodb: come raggruppare e contare"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Puoi utilizzare la seguente sintassi per raggruppare e contare in MongoDB:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.collection.aggregate([\n    { <span style=\"color: #ff0000;\">$group<\/span> : { <span style=\"color: #3366ff;\">_id<\/span> : \" <span style=\"color: #ff0000;\">$field_name<\/span> \", <span style=\"color: #3366ff;\">count<\/span> :{ <span style=\"color: #3366ff;\">$sum<\/span> :1}}}\n])<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Tieni presente che <span style=\"padding: 1px; border: 1px solid black;\">field_name<\/span> \u00e8 il campo in base al quale desideri raggruppare.<\/span><\/p>\n<p> <span style=\"color: #000000;\">I seguenti esempi mostrano come utilizzare questa sintassi con un <span style=\"padding: 1px; border: 1px solid black;\">team<\/span> di riscossione con i seguenti documenti:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Mavs<\/span> \", position: \" <span style=\"color: #008000;\">Guard<\/span> \", points: <span style=\"color: #ff0000;\">31<\/span> })<\/strong>\n<strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Spurs<\/span> \", position: \" <span style=\"color: #008000;\">Guard<\/span> \", points: <span style=\"color: #ff0000;\">22<\/span> })<\/strong>\n<strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Rockets<\/span> \", position: \" <span style=\"color: #008000;\">Center<\/span> \", points: <span style=\"color: #ff0000;\">19<\/span> })<\/strong>\n<strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Warriors<\/span> \", position: \" <span style=\"color: #008000;\">Forward<\/span> \", points: <span style=\"color: #ff0000;\">26<\/span> })<\/strong>\n<strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Cavs<\/span> \", position: \" <span style=\"color: #008000;\">Guard<\/span> \", points: <span style=\"color: #ff0000;\">33<\/span> })<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 1: raggruppare e contare<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare il seguente codice per raggruppare per campo &#8220;posizione&#8221; e contare le occorrenze di ciascuna posizione.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate([\n    { <span style=\"color: #ff0000;\">$group<\/span> : { <span style=\"color: #3366ff;\">_id<\/span> : \" <span style=\"color: #ff0000;\">$position<\/span> \", <span style=\"color: #3366ff;\">count<\/span> :{ <span style=\"color: #3366ff;\">$sum<\/span> :1}}}\n])\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Ci\u00f2 restituisce i seguenti risultati:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ _id: ' <span style=\"color: #008000;\">Forward<\/span> ', count: 1 }\n{ _id: ' <span style=\"color: #008000;\">Guard<\/span> ', count: 3 }\n{ _id: ' <span style=\"color: #008000;\">Center<\/span> ', count: 1 }<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Questo ci dice:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">La posizione \u201cAvanti\u201d appare <strong>1<\/strong> volta.<\/span><\/li>\n<li> <span style=\"color: #000000;\">La posizione \u201cGuardia\u201d appare <strong>3<\/strong> volte.<\/span><\/li>\n<li> <span style=\"color: #000000;\">La posizione \u201cCentro\u201d appare <strong>1<\/strong> volta.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 2: raggruppare e contare (quindi ordinare)<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare il seguente codice per contare le occorrenze di ciascuna posizione e ordinare automaticamente i risultati in <strong>ordine crescente<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate([\n    { <span style=\"color: #ff0000;\">$group<\/span> : { <span style=\"color: #3366ff;\">_id<\/span> : \" <span style=\"color: #ff0000;\">$position<\/span> \", <span style=\"color: #3366ff;\">count<\/span> :{ <span style=\"color: #3366ff;\">$sum<\/span> :1}}},\n    { <span style=\"color: #ff0000;\">$sort<\/span> : { <span style=\"color: #3366ff;\">count<\/span> : 1}} \n])\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Ci\u00f2 restituisce i seguenti risultati:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ _id: ' <span style=\"color: #008000;\">Forward<\/span> ', count: 1 }\n{ _id: ' <span style=\"color: #008000;\">Center<\/span> ', count: 1 }\n{ _id: ' <span style=\"color: #008000;\">Guard<\/span> ', count: 3 }\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Possiamo usare <strong>-1<\/strong> nell&#8217;argomento count per ordinare i risultati in <strong>ordine decrescente<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate([\n    { <span style=\"color: #ff0000;\">$group<\/span> : { <span style=\"color: #3366ff;\">_id<\/span> : \" <span style=\"color: #ff0000;\">$position<\/span> \", <span style=\"color: #3366ff;\">count<\/span> :{ <span style=\"color: #3366ff;\">$sum<\/span> :1}}},\n    { <span style=\"color: #ff0000;\">$sort<\/span> : { <span style=\"color: #3366ff;\">count<\/span> :-1}} \n])\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Ci\u00f2 restituisce i seguenti risultati:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ _id: ' <span style=\"color: #008000;\">Guard<\/span> ', count: 3 }\n{ _id: ' <span style=\"color: #008000;\">Forward<\/span> ', count: 1 }\n{ _id: ' <span style=\"color: #008000;\">Center<\/span> ', count: 1 }<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : puoi trovare la documentazione completa per <strong>$group<\/strong> <a href=\"https:\/\/docs.mongodb.com\/manual\/reference\/operator\/aggregation\/group\/\" target=\"_blank\" rel=\"noopener\">qui<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">I seguenti tutorial spiegano come eseguire altre operazioni comuni in MongoDB:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-somma\/\" target=\"_blank\" rel=\"noopener\">MongoDB: come raggruppare e sommare<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/account-separato-mongodb\/\" target=\"_blank\" rel=\"noopener\">MongoDB: come contare valori distinti in un campo<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-piu-campi\/\" target=\"_blank\" rel=\"noopener\">MongoDB: come raggruppare per pi\u00f9 campi<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Puoi utilizzare la seguente sintassi per raggruppare e contare in MongoDB: db.collection.aggregate([ { $group : { _id : &#8221; $field_name &#8220;, count :{ $sum :1}}} ]) Tieni presente che field_name \u00e8 il campo in base al quale desideri raggruppare. I seguenti esempi mostrano come utilizzare questa sintassi con un team di riscossione con i seguenti [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MongoDB: Come raggruppare e contare - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come raggruppare e contare in MongoDB, inclusi esempi.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MongoDB: Come raggruppare e contare - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come raggruppare e contare in MongoDB, inclusi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-22T11:32:40+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\",\"url\":\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\",\"name\":\"MongoDB: Come raggruppare e contare - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-22T11:32:40+00:00\",\"dateModified\":\"2023-07-22T11:32:40+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come raggruppare e contare in MongoDB, inclusi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mongodb: come raggruppare e contare\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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