{"id":16777,"date":"2022-07-17T09:50:33","date_gmt":"2022-07-17T09:50:33","guid":{"rendered":"https:\/\/soloweb.com.br\/blog\/?p=16777"},"modified":"2023-04-12T00:08:25","modified_gmt":"2023-04-12T00:08:25","slug":"melhorando-desempenho-de-consultas-sql-com-cte-common-table-expressions","status":"publish","type":"post","link":"https:\/\/soloweb.com.br\/blog\/2022\/07\/17\/melhorando-desempenho-de-consultas-sql-com-cte-common-table-expressions\/","title":{"rendered":"Melhorando desempenho de consultas SQL com CTE (Common Table Expressions)"},"content":{"rendered":"\n<p>Neste tutorial, voc\u00ea aprender\u00e1 como usar o  CTE (common table expression) ou express\u00e3o de tabela comum, tamb\u00e9m s\u00e3o chamadas de &#8220;WITH querys&#8221;, e sua finalidade \u00e9 simplificar consultas complexas e geralmente melhora o desempenho.<\/p>\n\n\n\n<p>Uma CTE \u00e9 um conjunto de resultados tempor\u00e1rio que voc\u00ea pode fazer refer\u00eancia em outra instru\u00e7\u00e3o SQL, incluindo <strong>SELECT,  INSERT, UPDATE e DELETE.<\/strong><\/p>\n\n\n\n<p>As Express\u00f5es de Tabela Comuns s\u00e3o tempor\u00e1rias no sentido de que s\u00f3 existem durante a execu\u00e7\u00e3o da consulta.<\/p>\n\n\n\n<p>CTE existe nos principais banco de dados, por exemplo: Oracle, SqlServer, MySql, MariaDB, SQLite  e outros, em nossos exemplos vamos utilizar o PostgreSQL como base.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Melhorando desempenho de consultas SQL com CTE\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/Te0KT7UZ-H8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><strong>Vantagens de usar CTE<\/strong><br>A seguir est\u00e3o algumas vantagens de usar express\u00f5es de tabela comuns ou CTEs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Melhore a legibilidade de consultas complexas. Voc\u00ea usa CTEs para organizar consultas complexas de maneira mais organizada e leg\u00edvel.<\/li>\n\n\n\n<li>Capacidade de criar consultas recursivas. Consultas recursivas s\u00e3o consultas que fazem refer\u00eancia a si mesmas. As consultas recursivas s\u00e3o \u00fateis quando voc\u00ea deseja consultar dados hier\u00e1rquicos.<\/li>\n\n\n\n<li>Use em conjunto com fun\u00e7\u00f5es. Voc\u00ea pode usar CTEs em conjunto com fun\u00e7\u00f5es para criar um conjunto de resultados inicial e usar outra instru\u00e7\u00e3o <strong>select<\/strong> para processar ainda mais esse conjunto de resultados.<\/li>\n<\/ul>\n\n\n\n<p>Veja a seguir a sintaxe de cria\u00e7\u00e3o de um CTE:<\/p>\n\n\n\n<p>Primeiro defina o nome e as colunas do CTE.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WITH cte_identificador (coluna1, coluna2)  \nAS <\/code><\/pre>\n\n\n\n<p>Em seguida o corpo da consulta.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WITH cte_identificador (coluna1, coluna2)\nAS (\n  SELECT 1, 2\n)<\/code><\/pre>\n\n\n\n<p>Por \u00faltimo, defina a consulta externa, que far\u00e1 refer\u00eancia ao nome CTE.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WITH cte_identificador (coluna1, coluna2)  \nAS (  \n    SELECT 1, 2 \n   ) \nSELECT * FROM cte_identificador<\/code><\/pre>\n\n\n\n<p>Voc\u00ea tamb\u00e9m pode fazer CTEs recursivo, adicionando a palavra chave: &#8220;recursive&#8221;!&nbsp;Depois de adicionar &#8220;recursive&#8221;, o Postgres agora permite   que voc\u00ea fa\u00e7a refer\u00eancia ao seu CTE de dentro de si mesmo, permitindo que voc\u00ea \u201cgere\u201d linhas com base na recurs\u00e3o.<\/p>\n\n\n\n<p>Agora um exemplo simples.<\/p>\n\n\n\n<p><strong>Vamos supor que queremos saber qual foi a m\u00e9dia da turma e qual m\u00e9dia dos alunos foi maior que a m\u00e9dia da turma? Qual foi a m\u00e9dia de cada um desses alunos?<\/strong><\/p>\n\n\n\n<p>Uma solu\u00e7\u00e3o utilizando CTE:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WITH cte_media_aluno  AS (\n\tSELECT id_aluno, ROUND(AVG(nota),2) as media_aluno\n        FROM tb_notas \n        GROUP BY tb_notas.id_aluno\n), \ncte_media_turma AS (\n\tSELECT ROUND(AVG(nota),2) as media_sala\n        FROM tb_notas \n)\n\nSELECT id_aluno, media_aluno, cte_media_turma.media_sala\nFROM cte_media_aluno\nJOIN cte_media_turma  ON TRUE\nWHERE media_aluno > media_sala;<\/code><\/pre>\n\n\n\n<p>Temos o seguinte resultado:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"315\" height=\"596\" src=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2022\/07\/post.png\" alt=\"\" class=\"wp-image-16801\" srcset=\"https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2022\/07\/post.png 315w, https:\/\/soloweb.com.br\/blog\/wp-content\/uploads\/2022\/07\/post-159x300.png 159w\" sizes=\"auto, (max-width: 315px) 100vw, 315px\" \/><\/figure>\n\n\n\n<p>Agora vamos observar a solu\u00e7\u00e3o sem utilizar CTE:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT id_aluno, media_aluno, nt.media_sala\nFROM (\n SELECT id_aluno, ROUND(AVG(nota),2) as media_aluno\n        FROM tb_notas \n        GROUP BY tb_notas.id_aluno\n) \nJOIN (\n SELECT ROUND(AVG(nota),2) as media_sala\n        FROM tb_notas \n)  AS nt\n    ON TRUE\nWHERE media_aluno &gt; media_sala;<\/code><\/pre>\n\n\n\n<p> Fica bem vis\u00edvel que a consulta com CTE melhora a legibilidade da consulta e consequentemente manuten\u00e7\u00e3o futura j\u00e1 que separamos bem cada informa\u00e7\u00e3o que precisamos.<\/p>\n\n\n\n<p>Tamb\u00e9m \u00e9 f\u00e1cil observar que quanto mais complexo \u00e9 sua consultar melhor se encaixa os CTE.<\/p>\n\n\n\n<p>S\u00f3 para esclarecer, os CTEs t\u00eam seu lugar. Eles tornam o c\u00f3digo mais f\u00e1cil de ler, mas n\u00e3o \u00e9 apropriado para qualquer consulta SQL.<\/p>\n\n\n\n<p>No pr\u00f3ximo post vamos mostrar mais exemplos e os reais resultados ao usar CTE.<\/p>\n\n\n\n<p>Esperamos ter ajudado com esta dica, siga nos para mais dicas.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Neste tutorial, voc\u00ea aprender\u00e1 como usar o CTE (common table expression) ou express\u00e3o de tabela comum, tamb\u00e9m s\u00e3o chamadas de<\/p>\n","protected":false},"author":4,"featured_media":16815,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"categories":[118],"tags":[142,263,147,262,253],"class_list":["post-16777","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-performance","tag-banco-de-dados","tag-cte","tag-desempenho","tag-postgresql","tag-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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