{"id":1116,"date":"2024-07-31T11:17:22","date_gmt":"2024-07-31T09:17:22","guid":{"rendered":"https:\/\/blog.sutilweb.eu\/?page_id=1116"},"modified":"2024-07-31T11:17:22","modified_gmt":"2024-07-31T09:17:22","slug":"16-clausula-update-y-delete","status":"publish","type":"page","link":"https:\/\/sutilweb.eu\/index.php\/databases\/sql\/16-clausula-update-y-delete\/","title":{"rendered":"16. Cla\u00fasula UPDATE y DELETE"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Cla\u00fasula <em>UPDATE<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La clausula <strong><em>UPDATE<\/em><\/strong> va a tener un formato muy parecido a una de las formas de la clausula <strong><em>INSERT.<\/em><\/strong> Veamos su sintaxis.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ejm<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">UPDATE usuarios SET (\n nombre = \"Federico\",\n apellidos = \"Parralejo\"\n) WHERE nombre = \"Francisco\";<\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Nota:<\/strong> la clausula <strong>UPDATE<\/strong> debe ir acompa\u00f1ada de la clausula <strong>WHERE,<\/strong> de lo contrario actualizar\u00e1 todos los registros de la tabla con los nuevos valores.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Cla\u00fasula <em>DELETE<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La sintaxis de la clausula <strong><em>DELETE<\/em><\/strong> es muy sencilla.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ejm<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">-- Eliminar usuario Francisco\nDELETE * FROM usuarios WHERE nombre = \"Francisco\";<\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Nota:<\/strong> al igual que con la sentencia <strong>UPDATE,<\/strong> la sentencia <strong>DELETE<\/strong> debe ir acompa\u00f1ada de la sentencia <strong>WHERE<\/strong> con una condici\u00f3n, para que no borre todos los registros.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Cla\u00fasula UPDATE La clausula UPDATE va a tener un formato muy parecido a una de las formas de la clausula INSERT. Veamos su sintaxis.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1076,"menu_order":15,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1116","page","type-page","status-publish","hentry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Sutil Web","author_link":"https:\/\/sutilweb.eu\/index.php\/author\/sutilweb\/"},"uagb_comment_info":0,"uagb_excerpt":"Cla\u00fasula UPDATE La clausula UPDATE va a tener un formato muy parecido a una de las formas de la clausula INSERT. Veamos su sintaxis.","_links":{"self":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/comments?post=1116"}],"version-history":[{"count":1,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1116\/revisions"}],"predecessor-version":[{"id":1117,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1116\/revisions\/1117"}],"up":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/1076"}],"wp:attachment":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/media?parent=1116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}