{"id":2444,"date":"2023-07-22T06:16:57","date_gmt":"2023-07-22T06:16:57","guid":{"rendered":"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/"},"modified":"2023-07-22T06:16:57","modified_gmt":"2023-07-22T06:16:57","slug":"mongodb-encontra-duplicatas","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/","title":{"rendered":"Como encontrar duplicatas no mongodb"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Voc\u00ea pode usar a seguinte sintaxe para localizar documentos com valores duplicados no MongoDB:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.collection.aggregate([\n    {\" <span style=\"color: #ff0000;\">$group<\/span> \": { \"_id\": \" <span style=\"color: #ff0000;\">$field1<\/span> \", \"count\": { \" <span style=\"color: #ff0000;\">$sum<\/span> \": 1 } } },\n    {\" <span style=\"color: #ff0000;\">$match<\/span> \": {\"_id\" :{ \" <span style=\"color: #ff0000;\">$ne<\/span> \" : null } , \"count\" : {\" <span style=\"color: #ff0000;\">$gt<\/span> \": 1} } }, \n    {\" <span style=\"color: #ff0000;\">$project<\/span> \": {\"name\": \" <span style=\"color: #ff0000;\">$_id<\/span> \", \"_id\": 0} }\n])\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Aqui est\u00e1 o que esta sintaxe faz:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>Agrupe<\/strong> todos os documentos com o mesmo valor no campo 1<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>Corresponder<\/strong> grupos que possuem mais de um documento<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>Projetar<\/strong> todos os grupos que possuem mais de um documento<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Esta consulta espec\u00edfica procura valores duplicados na coluna <strong>field1<\/strong> . Basta editar este valor para alterar o campo de pesquisa.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como usar essa sintaxe com uma <span style=\"padding: 1px; border: 1px solid black;\">equipe<\/span> de coleta com os seguintes documentos:<\/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> })<\/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>Exemplo: Localizar documentos com valores duplicados<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo para encontrar todos os valores duplicados na coluna \u201cequipe\u201d:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate([\n    {\" <span style=\"color: #ff0000;\">$group<\/span> \": { \"_id\": \" <span style=\"color: #ff0000;\">$team<\/span> \", \"count\": { \" <span style=\"color: #ff0000;\">$sum<\/span> \": 1 } } },\n    {\" <span style=\"color: #ff0000;\">$match<\/span> \": {\"_id\" :{ \" <span style=\"color: #ff0000;\">$ne<\/span> \" : null } , \"count\" : {\" <span style=\"color: #ff0000;\">$gt<\/span> \": 1} } }, \n    {\" <span style=\"color: #ff0000;\">$project<\/span> \": {\"name\": \" <span style=\"color: #ff0000;\">$_id<\/span> \", \"_id\": 0} }\n])<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Esta consulta retorna os seguintes resultados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ name: 'Rockets' }\n{ name: 'Mavs' }<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Isso nos diz que os valores \u201cRockets\u201d e \u201cMavs\u201d aparecem m\u00faltiplas vezes no campo \u201cteam\u201d.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Observe que podemos simplesmente substituir <strong>$team<\/strong> por <strong>$position<\/strong> para procurar valores duplicados no campo &#8220;position&#8221;:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>db.teams.aggregate([\n    {\" <span style=\"color: #ff0000;\">$group<\/span> \": { \"_id\": \" <span style=\"color: #ff0000;\">$position<\/span> \", \"count\": { \" <span style=\"color: #ff0000;\">$sum<\/span> \": 1 } } },\n    {\" <span style=\"color: #ff0000;\">$match<\/span> \": {\"_id\" :{ \" <span style=\"color: #ff0000;\">$ne<\/span> \" : null } , \"count\" : {\" <span style=\"color: #ff0000;\">$gt<\/span> \": 1} } }, \n    {\" <span style=\"color: #ff0000;\">$project<\/span> \": {\"name\": \" <span style=\"color: #ff0000;\">$_id<\/span> \", \"_id\": 0} }\n])<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Esta consulta retorna os seguintes resultados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>{ name: 'Guard' }\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Isto nos diz que \u201cGuarda\u201d aparece v\u00e1rias vezes no campo \u201cposi\u00e7\u00e3o\u201d.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como realizar outras opera\u00e7\u00f5es comuns no MongoDB:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/mongodb-adicionar-campo\/\" target=\"_blank\" rel=\"noopener\">MongoDB: Como adicionar um novo campo a uma cole\u00e7\u00e3o<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/grupo-mongodb-por-numero\/\" target=\"_blank\" rel=\"noopener\">MongoDB: Como agrupar e contar<\/a><br \/><a href=\"https:\/\/statorials.org\/pt\/grupo-mongodb-por-varios-campos\/\" target=\"_blank\" rel=\"noopener\">MongoDB: Como agrupar por v\u00e1rios campos<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea pode usar a seguinte sintaxe para localizar documentos com valores duplicados no MongoDB: db.collection.aggregate([ {&#8221; $group &#8220;: { &#8220;_id&#8221;: &#8221; $field1 &#8220;, &#8220;count&#8221;: { &#8221; $sum &#8220;: 1 } } }, {&#8221; $match &#8220;: {&#8220;_id&#8221; :{ &#8221; $ne &#8221; : null } , &#8220;count&#8221; : {&#8221; $gt &#8220;: 1} } }, {&#8221; $project &#8220;: [&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-2444","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como encontrar duplicatas no MongoDB \u2013 Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como encontrar valores duplicados no MongoDB, com v\u00e1rios exemplos.\" \/>\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\/pt\/mongodb-encontra-duplicatas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como encontrar duplicatas no MongoDB \u2013 Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como encontrar valores duplicados no MongoDB, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-22T06:16:57+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/\",\"url\":\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/\",\"name\":\"Como encontrar duplicatas no MongoDB \u2013 Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-22T06:16:57+00:00\",\"dateModified\":\"2023-07-22T06:16:57+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como encontrar valores duplicados no MongoDB, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/mongodb-encontra-duplicatas\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como encontrar duplicatas no mongodb\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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