{"id":2444,"date":"2023-07-22T06:18:38","date_gmt":"2023-07-22T06:18:38","guid":{"rendered":"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/"},"modified":"2023-07-22T06:18:38","modified_gmt":"2023-07-22T06:18:38","slug":"mongodb-piu-campi-distinti","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/","title":{"rendered":"Mongodb: come selezionare valori distinti da pi\u00f9 campi"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u00c8 possibile utilizzare la seguente sintassi per selezionare valori distinti in pi\u00f9 campi in MongoDB:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.collection.aggregate( \n            [\n                { <span style=\"color: #ff0000;\">$group<\/span> : { \"_id\": { field1: \" <span style=\"color: #ff0000;\">$field1<\/span> \", field2: \" <span style=\"color: #ff0000;\">$field2<\/span> \" } } }\n            ]\n        )<\/strong><\/pre>\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;\">Mavs<\/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;\">Rockets<\/span> \", position: \" <span style=\"color: #008000;\">Forward<\/span> \", points: <span style=\"color: #ff0000;\">26<\/span> })\n<\/strong><strong>db.teams.insertOne({team: \" <span style=\"color: #008000;\">Rockets<\/span> \", position: \" <span style=\"color: #008000;\">Forward<\/span> \", points: <span style=\"color: #ff0000;\">29<\/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: selezionare valori distinti in pi\u00f9 campi<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare la seguente query per trovare tutti i valori distinti dei campi di squadra e posizione:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate( \n            [\n                { <span style=\"color: #ff0000;\">$group<\/span> : { \"_id\": { team: \" <span style=\"color: #ff0000;\">$team<\/span> \", position: \" <span style=\"color: #ff0000;\">$position<\/span> \" } } }\n            ]\n        )\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Questa query restituisce i seguenti documenti:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ _id: { team: 'Mavs', position: 'Guard' } }\n{ _id: { team: 'Rockets', position: 'Forward' } }\n{ _id: { team: 'Rockets', position: 'Center' } }\n{ _id: { team: 'Cavs', position: 'Guard' } }<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">E possiamo utilizzare la seguente query per trovare tutti i valori distinti dei campi squadra, posizione e punti:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate( \n        [\n          { <span style=\"color: #ff0000;\">$group<\/span> : {\"_id\": {team: \" <span style=\"color: #ff0000;\">$team<\/span> \", position: \" <span style=\"color: #ff0000;\">$position<\/span> \", points: \" <span style=\"color: #ff0000;\">$points<\/span> \"}}}\n        ]\n    )\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Questa query restituisce i seguenti documenti:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ _id: { team: 'Cavs', position: 'Guard', points: 33 } }\n{ _id: { team: 'Rockets', position: 'Forward', points: 29 } }\n{ _id: { team: 'Mavs', position: 'Guard', points: 22 } }\n{ _id: { team: 'Rockets', position: 'Forward', points: 26 } }\n{ _id: { team: 'Mavs', position: 'Guard', points: 31 } }\n{ _id: { team: 'Rockets', position: 'Center', points: 19 } }<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Tieni presente che tutti i documenti vengono restituiti perch\u00e9 non esistono due documenti con valori identici per i campi squadra, posizione <em>e<\/em> punti.<\/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\/mongodb-aggiungi-campo\/\" target=\"_blank\" rel=\"noopener\">MongoDB: come aggiungere un nuovo campo a una raccolta<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/gruppo-mongodb-per-numero\/\" target=\"_blank\" rel=\"noopener\">MongoDB: come raggruppare e contare<\/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>\u00c8 possibile utilizzare la seguente sintassi per selezionare valori distinti in pi\u00f9 campi in MongoDB: db.collection.aggregate( [ { $group : { &#8220;_id&#8221;: { field1: &#8221; $field1 &#8220;, field2: &#8221; $field2 &#8221; } } } ] ) I seguenti esempi mostrano come utilizzare questa sintassi con un team di riscossione con i seguenti documenti: db.teams.insertOne({team: &#8221; [&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 selezionare valori distinti da pi\u00f9 campi - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come selezionare valori distinti da pi\u00f9 campi in MongoDB, incluso un esempio.\" \/>\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\/mongodb-piu-campi-distinti\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MongoDB: Come selezionare valori distinti da pi\u00f9 campi - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come selezionare valori distinti da pi\u00f9 campi in MongoDB, incluso un esempio.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-22T06:18:38+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\/mongodb-piu-campi-distinti\/\",\"url\":\"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/\",\"name\":\"MongoDB: Come selezionare valori distinti da pi\u00f9 campi - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-22T06:18:38+00:00\",\"dateModified\":\"2023-07-22T06:18:38+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come selezionare valori distinti da pi\u00f9 campi in MongoDB, incluso un esempio.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/mongodb-piu-campi-distinti\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mongodb: come selezionare valori distinti da pi\u00f9 campi\"}]},{\"@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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