{"id":2393,"date":"2023-07-22T11:32:40","date_gmt":"2023-07-22T11:32:40","guid":{"rendered":"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/"},"modified":"2023-07-22T11:32:40","modified_gmt":"2023-07-22T11:32:40","slug":"mongodb-groeperen-op-nummer","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/","title":{"rendered":"Mongodb: groeperen op en tellen"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende syntaxis gebruiken om te groeperen en tellen 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;\">Houd er rekening mee dat <span style=\"padding: 1px; border: 1px solid black;\">veldnaam<\/span> het veld is waarop u wilt groeperen.<\/span><\/p>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u deze syntaxis kunt gebruiken met een <span style=\"padding: 1px; border: 1px solid black;\">incassoteam<\/span> met de volgende documenten:<\/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>Voorbeeld 1: groeperen op en tellen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">We kunnen de volgende code gebruiken om te groeperen op &#8218;positie&#8216;-veld en het aantal keren dat elke positie voorkomt te tellen.<\/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;\">Dit levert de volgende resultaten op:<\/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;\">Dit vertelt ons:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">De positie \u201cVooruit\u201d verschijnt <strong>1<\/strong> keer.<\/span><\/li>\n<li> <span style=\"color: #000000;\">De positie \u201cBewaker\u201d verschijnt <strong>3<\/strong> keer.<\/span><\/li>\n<li> <span style=\"color: #000000;\">De positie \u201cMidden\u201d verschijnt <strong>1<\/strong> keer.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 2: groeperen op en tellen (en vervolgens sorteren)<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">We kunnen de volgende code gebruiken om het aantal keren dat elke positie voorkomt te tellen en de resultaten automatisch in <strong>oplopende volgorde<\/strong> te sorteren:<\/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;\">Dit levert de volgende resultaten op:<\/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;\">We kunnen <strong>-1<\/strong> gebruiken in het count-argument om de resultaten in <strong>aflopende volgorde<\/strong> te sorteren:<\/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;\">Dit levert de volgende resultaten op:<\/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>Opmerking<\/strong> : u kunt de volledige documentatie voor <strong>$group<\/strong> <a href=\"https:\/\/docs.mongodb.com\/manual\/reference\/operator\/aggregation\/group\/\" target=\"_blank\" rel=\"noopener\">hier<\/a> vinden.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende bewerkingen in MongoDB kunt uitvoeren:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/mongodb-groep-op-som\/\" target=\"_blank\" rel=\"noopener\">MongoDB: Groeperen op en optellen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/aparte-rekening-van-mongodb\/\" target=\"_blank\" rel=\"noopener\">MongoDB: Hoe verschillende waarden in een veld te tellen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-meerdere-velden\/\" target=\"_blank\" rel=\"noopener\">MongoDB: groeperen op meerdere velden<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende syntaxis gebruiken om te groeperen en tellen in MongoDB: db.collection.aggregate([ { $group : { _id : &#8220; $field_name &#8222;, count :{ $sum :1}}} ]) Houd er rekening mee dat veldnaam het veld is waarop u wilt groeperen. De volgende voorbeelden laten zien hoe u deze syntaxis kunt gebruiken met een incassoteam [&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":[],"class_list":["post-2393","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MongoDB: Groeperen op en tellen - Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u kunt groeperen en tellen in MongoDB, inclusief voorbeelden.\" \/>\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\/nl\/mongodb-groeperen-op-nummer\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MongoDB: Groeperen op en tellen - Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u kunt groeperen en tellen in MongoDB, inclusief voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/\" \/>\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=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/\",\"url\":\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/\",\"name\":\"MongoDB: Groeperen op en tellen - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-22T11:32:40+00:00\",\"dateModified\":\"2023-07-22T11:32:40+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u kunt groeperen en tellen in MongoDB, inclusief voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/mongodb-groeperen-op-nummer\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mongodb: groeperen op en tellen\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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