{"id":4787,"date":"2021-12-14T01:23:46","date_gmt":"2021-12-14T01:23:46","guid":{"rendered":"https:\/\/diferenciario.com\/br\/union-e-union-all\/"},"modified":"2021-12-14T01:23:46","modified_gmt":"2021-12-14T01:23:46","slug":"union-e-union-all","status":"publish","type":"post","link":"https:\/\/diferenciario.com\/br\/union-e-union-all\/","title":{"rendered":"Diferen\u00e7a entre UNION e UNION ALL"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2581\" src=\"https:\/\/diferenciario.com\/br\/wp-content\/uploads\/union-e-union-all.webp\" alt=\"Diferen\u00e7a entre UNION e UNION ALL\" width=\"650\" height=\"450\" \/><\/p>\n<div>\n<h2>Principal diferen\u00e7a<\/h2>\n<p>UNION e UNION ALL s\u00e3o usados \u200b\u200bpara combinar os resultados de consultas selecionadas. UNION ALL registra todos os resultados, incluindo duplicatas. UNION n\u00e3o registra resultados duplicados. UNION ALL \u00e9 mais r\u00e1pido que UNION. Em relat\u00f3rios e aplica\u00e7\u00f5es, UNION \u00e9 melhor que UNION ALL, pois resultados duplicados n\u00e3o s\u00e3o adequados.<\/p>\n<h2>O que \u00e9 UNI\u00c3O?<\/h2>\n<p>O comando UNION \u00e9 usado para selecionar os resultados de duas consultas que possuem o mesmo n\u00famero de colunas. N\u00e3o seleciona resultados duplicados, apenas entradas diferentes s\u00e3o selecionadas. UNION \u00e9 comparativamente lento. UNION tem um desempenho mais lento porque precisa remover duplicatas usando uma classifica\u00e7\u00e3o diferente. As tabelas das quais UNION precisa selecionar resultados, o n\u00famero de colunas deve ser o mesmo.<\/p>\n<h2>O que \u00e9 UNION ALL?<\/h2>\n<p>O comando UNION ALL \u00e9 usado para selecionar os resultados de duas consultas que possuem o mesmo n\u00famero de colunas. Ele tamb\u00e9m seleciona resultados duplicados. UNION ALL \u00e9 mais r\u00e1pido, mas pode parecer baixo devido ao n\u00famero de duplicatas que ser\u00e3o retornadas. As tabelas cujos resultados precisam ser selecionados por UNION ALL, o n\u00famero de colunas deve ser o mesmo.<\/p>\n<h2>Principais diferen\u00e7as<\/h2>\n<ol>\n<li>UNION ALL seleciona o resultado duplicado, mas UNION n\u00e3o seleciona o resultado duplicado.<\/li>\n<li>UNION ALL \u00e9 mais r\u00e1pido que UNION.<\/li>\n<li>UNION ALL parece mais lento que UNION devido ao n\u00famero de resultados duplicados que ser\u00e3o retornados.<\/li>\n<li>UNION ALL \u00e9 prefer\u00edvel a UNION para resultados mais r\u00e1pidos.<\/li>\n<li>UNION e UNION ALL s\u00f3 podem selecionar consultas da mesma tabela ou de duas das mesmas tabelas.<\/li>\n<li>As tabelas das quais os resultados devem ser selecionados por UNION ALL ou UNION, o n\u00famero de colunas deve ser o mesmo.<\/li>\n<li>O uso e o desempenho da largura de banda da rede s\u00e3o diferentes em UNION e UNION ALL.<\/li>\n<li>UNION \u00e9 mais lento que UNION ALL porque precisa remover duplicatas usando uma classifica\u00e7\u00e3o diferente.<\/li>\n<\/ol>\n<h2>V\u00eddeo Comparativo<\/h2>\n<p class=\"ayg-error\">Error 403 The request cannot be completed because you have exceeded your <a href=\"\/youtube\/v3\/getting-started#quota\">quota<\/a>. : quotaExceeded<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Principal diferen\u00e7a UNION e UNION ALL s\u00e3o usados \u200b\u200bpara combinar os resultados de consultas selecionadas. UNION ALL registra todos os resultados, incluindo duplicatas. UNION n\u00e3o registra resultados duplicados. UNION ALL \u00e9 mais r\u00e1pido que UNION. Em relat\u00f3rios e aplica\u00e7\u00f5es, UNION \u00e9 melhor que UNION ALL, pois resultados duplicados n\u00e3o s\u00e3o adequados. O que \u00e9 UNI\u00c3O? &#8230; <a title=\"Diferen\u00e7a entre UNION e UNION ALL\" class=\"read-more\" href=\"https:\/\/diferenciario.com\/br\/union-e-union-all\/\" aria-label=\"M\u00e1s en Diferen\u00e7a entre UNION e UNION ALL\">Leia mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[5242,1725],"class_list":["post-4787","post","type-post","status-publish","format-standard","hentry","category-tecnologia","tag-toda-uniao","tag-uniao","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Diferen\u00e7a entre UNION e UNION ALL<\/title>\n<meta name=\"description\" content=\"lll\u27a4 Principal diferen\u00e7a UNION e UNION ALL s\u00e3o usados \u200b\u200bpara combinar os resultados de consultas selecionadas. UNION ALL registra todos os resultados,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/diferenciario.com\/br\/union-e-union-all\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diferen\u00e7a entre UNION e UNION ALL\" \/>\n<meta property=\"og:description\" content=\"lll\u27a4 Principal diferen\u00e7a UNION e UNION ALL s\u00e3o usados \u200b\u200bpara combinar os resultados de consultas selecionadas. 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