{"id":1121,"date":"2009-06-04T21:08:51","date_gmt":"2009-06-05T00:08:51","guid":{"rendered":"http:\/\/www.viamais.net\/blog\/?p=1121"},"modified":"2014-12-18T12:43:20","modified_gmt":"2014-12-18T15:43:20","slug":"utilizando-no-existsexists-ou-not-inin-no-plsql-oracle","status":"publish","type":"post","link":"https:\/\/www.viamais.net\/blog\/utilizando-no-existsexists-ou-not-inin-no-plsql-oracle\/","title":{"rendered":"Utilizando not exists \/ exists ou not in \/ in no PL\/SQL (Oracle)"},"content":{"rendered":"<p>[ad#texto]<\/p>\n<p>Existe uma certa confus\u00e3o no mundo <strong>Oracle<\/strong> sobre qual \u00e9 mais r\u00e1pido <em>not exists \/ exists<\/em> ou <em>not in \/ in<\/em>.<\/p>\n<figure id=\"attachment_6078\" aria-describedby=\"caption-attachment-6078\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/www.viamais.net\/blog\/wp-content\/uploads\/2009\/06\/PL-SQL-Developer.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6078 \" title=\"not exists ou not in?\" src=\"https:\/\/i0.wp.com\/www.viamais.net\/blog\/wp-content\/uploads\/2009\/06\/PL-SQL-Developer.jpg?resize=300%2C136\" alt=\"not exists ou not in?\" width=\"300\" height=\"136\" srcset=\"https:\/\/i0.wp.com\/www.viamais.net\/blog\/wp-content\/uploads\/2009\/06\/PL-SQL-Developer.jpg?resize=300%2C136&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.viamais.net\/blog\/wp-content\/uploads\/2009\/06\/PL-SQL-Developer.jpg?w=410&amp;ssl=1 410w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-6078\" class=\"wp-caption-text\">not exists ou not in?<\/figcaption><\/figure>\n<p>Por\u00e9m essa \u00e9 uma pergunta sem uma resposta direta e simples. Sabe porque? O <a href=\"http:\/\/www.oracle.com\/index.html\" target=\"_blank\"><strong>Oracle<\/strong><\/a> utiliza um avan\u00e7ado e complexo sistema de estat\u00edtica que coleta em tempo real o modo de utiliza\u00e7\u00e3o das queries do seu <strong>banco de dados<\/strong> e dessa forma otimiza sua engine (em tempo de execu\u00e7\u00e3o) para trabalhar de acordo com o seu pr\u00f3prio uso, ou seja, ele \u00e9 mutante.<\/p>\n<p>Assim para alguns desenvolvedores o <em>not in \/ in<\/em> pode ser mais r\u00e1pido e para outros o <em>not exists \/ exists<\/em> pode ser melhor, vai depender do seu ambiente de produ\u00e7\u00e3o e da sua implementa\u00e7\u00e3o do <strong>Oracle<\/strong>.<\/p>\n<p>Como fa\u00e7o para saber qual utilizar ent\u00e3o? Simples, implementando e testando ambos os casos, essa \u00e9 a melhor maneira de descobrir.<\/p>\n<p>Em todo caso vou listar exemplos de uso de ambas as situa\u00e7\u00f5es, voc\u00ea implementa, testa e verifica qual \u00e9 o mais r\u00e1pido e melhor para o seu uso.<\/p>\n<ul>\n<li>not exist\/exist:<\/li>\n<\/ul>\n<pre lang=sql>\r\nselect *\r\nfrom tabelaA\r\nwhere not exists (\r\n                 select campoA from tabelaB \r\n                 where campoB = valor\r\n                 )\r\n<\/pre>\n<p>ou<\/p>\n<pre lang=sql>\r\nselect *\r\nfrom tabelaA\r\nwhere exists (\r\n             select campoA from tabelaB \r\n             where campoB = valor\r\n             )\r\n<\/pre>\n<ul>\n<li>not in\/in:<\/li>\n<\/ul>\n<pre lang=sql>\r\nselect *\r\nfrom tabelaA\r\nwhere not in (\r\n             select campoA from tabelaB \r\n             where campoB = valor\r\n             )\r\n<\/pre>\n<p>ou<\/p>\n<pre lang=sql>\r\nselect *\r\nfrom tabelaA\r\nwhere in ( \r\n          select campoA from tabelaB \r\n          where campoB = valor\r\n         )\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>[ad#texto] Existe uma certa confus\u00e3o no mundo Oracle sobre qual \u00e9 mais r\u00e1pido not exists<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[26],"tags":[75],"class_list":["post-1121","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oracle"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Utilizando not exists \/ 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Al\u00e9m dos ambientes de desenvolvimento acima possuiu amplo conhecimento em servidores Apache\/Tomcat, Photoshop, Arte &amp; Foto, Flash e mais uma dezena de ferramentas e tecnologias emergentes. Atualmente colabora com o Viablog escrevendo sobre programa\u00e7\u00e3o e tecnologia.","sameAs":["http:\/\/www.viamais.net\/blog","https:\/\/www.facebook.com\/viamais.viablog"],"url":"https:\/\/www.viamais.net\/blog\/author\/petterrafael\/"}]}},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p5Ih4c-i5","jetpack-related-posts":[{"id":4838,"url":"https:\/\/www.viamais.net\/blog\/trabalhando-com-plsql-table-no-oracle\/","url_meta":{"origin":1121,"position":0},"title":"Trabalhando com PL\/SQL Table no Oracle","author":"Petter Rafael","date":"14\/03\/2013","format":false,"excerpt":"[ad#texto] Vari\u00e1veis de tabelas tamb\u00e9m s\u00e3o conhecidas como arrays, \u00a0index-by tables, PL\/SQL Tables ou ainda PL Tables. Este \u00e9 um recurso do PL\/SQL da Oracle bem interessante, pois permite criar uma esp\u00e9cie de tabela virtual (definir campos e seus tipos) e com base nesta defini\u00e7\u00e3o criar uma vari\u00e1vel com sua\u2026","rel":"","context":"Em &quot;Oracle&quot;","block_context":{"text":"Oracle","link":"https:\/\/www.viamais.net\/blog\/category\/oracle\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4860,"url":"https:\/\/www.viamais.net\/blog\/ordenando-uma-pl-table\/","url_meta":{"origin":1121,"position":1},"title":"Ordenando uma PL Table","author":"Petter Rafael","date":"18\/03\/2013","format":false,"excerpt":"[ad#texto] Em v\u00e1rios casos precisamos lan\u00e7ar m\u00e3o das famosas PL Table no Oracle, os motivos s\u00e3o diversos, e em v\u00e1rios casos n\u00e3o \u00e9 poss\u00edvel orden\u00e1-las no momento da grava\u00e7\u00e3o de dados, vamos ent\u00e3o ver como ordenar uma PL Table utilizando alguns recursos interessantes do PL\/SQL. Este caso de uso ir\u00e1\u2026","rel":"","context":"Em &quot;Oracle&quot;","block_context":{"text":"Oracle","link":"https:\/\/www.viamais.net\/blog\/category\/oracle\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4949,"url":"https:\/\/www.viamais.net\/blog\/utilizando-nocopy-no-oracle\/","url_meta":{"origin":1121,"position":2},"title":"Utilizando NOCOPY no Oracle","author":"Petter Rafael","date":"02\/04\/2013","format":false,"excerpt":"[ad#texto] J\u00e1 comentei sobre o modo como o PL\/SQL lida com os par\u00e2metros enviados, ele simplesmente movimenta todo o conte\u00fado ao inv\u00e9s de apenas acessar a instancia daquele objeto (par\u00e2metro) em mem\u00f3ria, em consequ\u00eancia temos uma gradativa perda de performance quando passamos par\u00e2metros maiores como um CLOB ou at\u00e9 mesmo\u2026","rel":"","context":"Em &quot;Dicas&quot;","block_context":{"text":"Dicas","link":"https:\/\/www.viamais.net\/blog\/category\/dicas\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5766,"url":"https:\/\/www.viamais.net\/blog\/arrays-em-oracle-plsql\/","url_meta":{"origin":1121,"position":3},"title":"Arrays em Oracle PL\/SQL","author":"Petter Rafael","date":"19\/12\/2013","format":false,"excerpt":"[ad#texto] Sempre encontramos v\u00e1rias d\u00favidas sobre como trabalhar com arrays e collections no Oracle Pl\/SQL, veja aqui uma forma f\u00e1cil de declarar um array e um exemplo de como utiliza-los: DECLARE nArray dbms_sql.varchar2_table; BEGIN nArray(1) := 'Jo\u00e3o'; nArray(2) := 'Maria'; nArray(3) := 'Amanda'; nArray(4) := 'Jos\u00e9'; FOR i IN nArray.FIRST\u2026","rel":"","context":"Em &quot;Dicas&quot;","block_context":{"text":"Dicas","link":"https:\/\/www.viamais.net\/blog\/category\/dicas\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2344,"url":"https:\/\/www.viamais.net\/blog\/nao-utilize-o-between\/","url_meta":{"origin":1121,"position":4},"title":"N\u00e3o utilize o between","author":"Petter Rafael","date":"09\/09\/2010","format":false,"excerpt":"[ad#texto] Essa \u00e9 para aqueles que s\u00e3o desenvolvedores Oracle, principalmente no PL\/SQL, suponha que algu\u00e9m lhe pergunte como consultar uma tabela levando em considera\u00e7\u00e3o um intervalo de data, como voc\u00ea faria isso? Seria algo semelhante a isso: select * from suaTabela where campoData between '010210' and '010310'; Se voc\u00ea faz\u2026","rel":"","context":"Em &quot;Dicas&quot;","block_context":{"text":"Dicas","link":"https:\/\/www.viamais.net\/blog\/category\/dicas\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2597,"url":"https:\/\/www.viamais.net\/blog\/acelerando-suas-consultas-plsql\/","url_meta":{"origin":1121,"position":5},"title":"Acelerando suas consultas PL\/SQL","author":"Petter Rafael","date":"28\/01\/2011","format":false,"excerpt":"[ad#texto] Sei que tunning no PL\/SQL \u00e9 pol\u00eamico, pois o assunto envolve al\u00e9m das regras e caracter\u00edsticas intr\u00ednsecas do banco de dados Oracle tamb\u00e9m caracter\u00edsticas \u00fanicas do sistema operacional em execu\u00e7\u00e3o do servidor, estrutura do hardware, m\u00e9todo da instala\u00e7\u00e3o e configura\u00e7\u00e3o do banco Oracle. Assim existem os casos reais e\u2026","rel":"","context":"Em &quot;Oracle&quot;","block_context":{"text":"Oracle","link":"https:\/\/www.viamais.net\/blog\/category\/oracle\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"jetpack_likes_enabled":false,"_links":{"self":[{"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/posts\/1121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/comments?post=1121"}],"version-history":[{"count":0,"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/posts\/1121\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/media?parent=1121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/categories?post=1121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.viamais.net\/blog\/wp-json\/wp\/v2\/tags?post=1121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}