{"id":140,"date":"2024-05-15T09:28:59","date_gmt":"2024-05-15T15:28:59","guid":{"rendered":"https:\/\/www.mariatech.com.mx\/blog\/?p=140"},"modified":"2026-05-21T11:38:48","modified_gmt":"2026-05-21T18:38:48","slug":"como-saber-si-un-registro-esta-duplicado-en-mysql","status":"publish","type":"post","link":"https:\/\/www.mariatech.com.mx\/blog\/mysql\/como-saber-si-un-registro-esta-duplicado-en-mysql\/","title":{"rendered":"C\u00f3mo saber si un registro est\u00e1 duplicado en MySQL"},"content":{"rendered":"<p>En algunas ocasiones es necesario saber si tenemos registros duplicados en nuestra base de datos, como lo pueden ser; correo electr\u00f3nico, alg\u00fan identificador, n\u00famero de tel\u00e9fono o cualquier otro dato.<\/p>\n<p>Para hacer esto lo podemos hacer con una consulta utilizando los comandos de <em>COUNT<\/em>, <em>GROUP BY<\/em> y <em>HAVING<\/em>,\u00a0 vamos a ver como ser\u00eda nuestra consulta:<\/p>\n\n\n<pre class=\"wp-block-code\"><code>SELECT name,COUNT(*) FROM clients\nGROUP BY name\nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">En esta consulta estamos solicitando de la tabla &#8220;clients&#8221; los registros donde el nombre se repita m\u00e1s de una vez.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"168\" src=\"https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-1024x168.png\" alt=\"\" class=\"wp-image-142\" srcset=\"https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-1024x168.png 1024w, https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-300x49.png 300w, https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-768x126.png 768w, https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-1536x252.png 1536w, https:\/\/www.mariatech.com.mx\/blog\/wp-content\/uploads\/2024\/05\/registro_dos-2048x335.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n<p>Ahora vamos a explicar qu\u00e9 hace cada comando:<\/p>\n<p><em>COUNT<\/em>: Regresa el n\u00famero de registros.<\/p>\n<p><em>GROUP BY<\/em>: Agrupa las filas que tiene el mismo valor y devuelve una \u00fanica fila de cada agrupaci\u00f3n realizada.<\/p>\n<p><em>HAVING<\/em>: Espec\u00edfica la condici\u00f3n que se aplica a los grupos, cu\u00e1ndo tenemos el comando <em>GROUP BY<\/em> no podemos usar la clausula <em>WHERE<\/em>, as\u00ed que ah\u00ed es donde usamos <em>HAVING.<\/em><\/p>\n<p>Si quieres saber m\u00e1s sobre estos comandos puedes buscar en la documentaci\u00f3n de MySQL:<\/p>\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/dev.mysql.com\/doc\">https:\/\/dev.mysql.com\/doc<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En algunas ocasiones es necesario saber si tenemos registros duplicados en nuestra base de datos, en este art\u00edculo veremos como obtenerlos&#8230;<\/p>\n","protected":false},"author":1,"featured_media":265,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-140","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/posts\/140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/comments?post=140"}],"version-history":[{"count":0,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/posts\/140\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/media\/265"}],"wp:attachment":[{"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/media?parent=140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/categories?post=140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mariatech.com.mx\/blog\/wp-json\/wp\/v2\/tags?post=140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}