{"id":40,"date":"2024-08-09T02:43:16","date_gmt":"2024-08-09T02:43:16","guid":{"rendered":"https:\/\/techkubo.com\/sql\/?p=40"},"modified":"2025-05-12T11:59:04","modified_gmt":"2025-05-12T11:59:04","slug":"sql-introduction","status":"publish","type":"post","link":"https:\/\/techkubo.com\/sql\/sql-introduction\/","title":{"rendered":"SQL Introduction"},"content":{"rendered":"\n<p>Structured Query Language (SQL) is the standard language used to communicate with relational databases. It allows users to store, retrieve, update, and manage data efficiently<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is SQL For?<\/h2>\n\n\n\n<p>SQL allows you to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Query data<\/strong> from one or more tables<\/li>\n\n\n\n<li><strong>Insert<\/strong>, <strong>update<\/strong>, or <strong>delete<\/strong> records<\/li>\n\n\n\n<li><strong>Join<\/strong> tables based on relationships<\/li>\n\n\n\n<li><strong>Sort<\/strong>, <strong>filter<\/strong>, and <strong>group<\/strong> data<\/li>\n\n\n\n<li>Handle <strong>NULL values<\/strong>, <strong>subqueries<\/strong>, and <strong>logical conditions<\/strong><\/li>\n<\/ul>\n\n\n\n<p>It\u2019s used in web applications, reporting systems, data analysis, backend development, and just about every industry that relies on data including tech, finance, healthcare, retail, education, and logistics.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Learn SQL?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It\u2019s used everywhere, from tech companies to banks to hospitals.<\/li>\n\n\n\n<li>It works with most relational databases: MySQL, PostgreSQL, SQL Server, Oracle, and even SQLite (used in our playground).<\/li>\n\n\n\n<li>It gives you control and visibility into your data.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Basic SQL Commands<\/h2>\n\n\n\n<p>SQL operates through simple yet powerful commands:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>SELECT<\/code> \u2013 Retrieves data.<\/li>\n\n\n\n<li><code>INSERT INTO<\/code> \u2013 Adds new records.<\/li>\n\n\n\n<li><code>UPDATE<\/code> \u2013 Modifies existing records.<\/li>\n\n\n\n<li><code>DELETE<\/code> \u2013 Removes records.<\/li>\n\n\n\n<li><code>CREATE TABLE<\/code> \u2013 Defines new tables.<\/li>\n\n\n\n<li><code>DROP TABLE<\/code> \u2013 Deletes tables.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SQL Select Syntax<\/h2>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:false,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;sql&quot;,&quot;mime&quot;:&quot;text\/x-sql&quot;,&quot;theme&quot;:&quot;default&quot;,&quot;lineNumbers&quot;:true,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;&quot;,&quot;language&quot;:&quot;SQL&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;sql&quot;}\">SELECT * FROM &lt;table&gt;;<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<iframe src=\"https:\/\/www.techkubo.com\/sql-sim.html\" title=\"Try SQL on TechKubo\" width=\"100%\" height=\"500\"><\/iframe>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Structured Query Language (SQL) is the standard language used to communicate with relational databases. It allows users to store, retrieve, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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":""},"categories":[1],"tags":[],"class_list":["post-40","post","type-post","status-publish","format-standard","hentry","category-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL Introduction - SQL Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techkubo.com\/sql\/sql-introduction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Introduction - SQL Tutorial\" \/>\n<meta property=\"og:description\" content=\"Structured Query Language (SQL) is the standard language used to communicate with relational databases. It allows users to store, retrieve, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/techkubo.com\/sql\/sql-introduction\/\" \/>\n<meta property=\"og:site_name\" content=\"SQL Tutorial\" \/>\n<meta property=\"article:published_time\" content=\"2024-08-09T02:43:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-12T11:59:04+00:00\" \/>\n<meta name=\"author\" content=\"Manong\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Manong\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/\"},\"author\":{\"name\":\"Manong\",\"@id\":\"https:\/\/techkubo.com\/sql\/#\/schema\/person\/b4fa2f01fa4ff2a4e98276ce47115965\"},\"headline\":\"SQL Introduction\",\"datePublished\":\"2024-08-09T02:43:16+00:00\",\"dateModified\":\"2025-05-12T11:59:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/\"},\"wordCount\":162,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/techkubo.com\/sql\/#organization\"},\"articleSection\":[\"SQL\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/techkubo.com\/sql\/sql-introduction\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/\",\"url\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/\",\"name\":\"SQL Introduction - SQL Tutorial\",\"isPartOf\":{\"@id\":\"https:\/\/techkubo.com\/sql\/#website\"},\"datePublished\":\"2024-08-09T02:43:16+00:00\",\"dateModified\":\"2025-05-12T11:59:04+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/techkubo.com\/sql\/sql-introduction\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/techkubo.com\/sql\/sql-introduction\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/techkubo.com\/sql\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SQL Introduction\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/techkubo.com\/sql\/#website\",\"url\":\"https:\/\/techkubo.com\/sql\/\",\"name\":\"SQL Tutorial\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/techkubo.com\/sql\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/techkubo.com\/sql\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/techkubo.com\/sql\/#organization\",\"name\":\"SQL Tutorial\",\"url\":\"https:\/\/techkubo.com\/sql\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/techkubo.com\/sql\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/techkubo.com\/sql\/wp-content\/uploads\/sites\/3\/2025\/01\/cropped-Techkubo-logo-1.png\",\"contentUrl\":\"https:\/\/techkubo.com\/sql\/wp-content\/uploads\/sites\/3\/2025\/01\/cropped-Techkubo-logo-1.png\",\"width\":1618,\"height\":1174,\"caption\":\"SQL Tutorial\"},\"image\":{\"@id\":\"https:\/\/techkubo.com\/sql\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/techkubo.com\/sql\/#\/schema\/person\/b4fa2f01fa4ff2a4e98276ce47115965\",\"name\":\"Manong\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/techkubo.com\/sql\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/21a7455736c21887b8fefe0935012d65?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/21a7455736c21887b8fefe0935012d65?s=96&d=mm&r=g\",\"caption\":\"Manong\"},\"sameAs\":[\"https:\/\/techkubo.com\"],\"url\":\"https:\/\/techkubo.com\/sql\/author\/manong\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"SQL Introduction - SQL Tutorial","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/techkubo.com\/sql\/sql-introduction\/","og_locale":"en_US","og_type":"article","og_title":"SQL Introduction - SQL Tutorial","og_description":"Structured Query Language (SQL) is the standard language used to communicate with relational databases. It allows users to store, retrieve, [&hellip;]","og_url":"https:\/\/techkubo.com\/sql\/sql-introduction\/","og_site_name":"SQL Tutorial","article_published_time":"2024-08-09T02:43:16+00:00","article_modified_time":"2025-05-12T11:59:04+00:00","author":"Manong","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Manong","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/#article","isPartOf":{"@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/"},"author":{"name":"Manong","@id":"https:\/\/techkubo.com\/sql\/#\/schema\/person\/b4fa2f01fa4ff2a4e98276ce47115965"},"headline":"SQL Introduction","datePublished":"2024-08-09T02:43:16+00:00","dateModified":"2025-05-12T11:59:04+00:00","mainEntityOfPage":{"@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/"},"wordCount":162,"commentCount":0,"publisher":{"@id":"https:\/\/techkubo.com\/sql\/#organization"},"articleSection":["SQL"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/techkubo.com\/sql\/sql-introduction\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/","url":"https:\/\/techkubo.com\/sql\/sql-introduction\/","name":"SQL Introduction - SQL Tutorial","isPartOf":{"@id":"https:\/\/techkubo.com\/sql\/#website"},"datePublished":"2024-08-09T02:43:16+00:00","dateModified":"2025-05-12T11:59:04+00:00","breadcrumb":{"@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/techkubo.com\/sql\/sql-introduction\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/techkubo.com\/sql\/sql-introduction\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/techkubo.com\/sql\/"},{"@type":"ListItem","position":2,"name":"SQL Introduction"}]},{"@type":"WebSite","@id":"https:\/\/techkubo.com\/sql\/#website","url":"https:\/\/techkubo.com\/sql\/","name":"SQL Tutorial","description":"","publisher":{"@id":"https:\/\/techkubo.com\/sql\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/techkubo.com\/sql\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/techkubo.com\/sql\/#organization","name":"SQL Tutorial","url":"https:\/\/techkubo.com\/sql\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/techkubo.com\/sql\/#\/schema\/logo\/image\/","url":"https:\/\/techkubo.com\/sql\/wp-content\/uploads\/sites\/3\/2025\/01\/cropped-Techkubo-logo-1.png","contentUrl":"https:\/\/techkubo.com\/sql\/wp-content\/uploads\/sites\/3\/2025\/01\/cropped-Techkubo-logo-1.png","width":1618,"height":1174,"caption":"SQL Tutorial"},"image":{"@id":"https:\/\/techkubo.com\/sql\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/techkubo.com\/sql\/#\/schema\/person\/b4fa2f01fa4ff2a4e98276ce47115965","name":"Manong","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/techkubo.com\/sql\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/21a7455736c21887b8fefe0935012d65?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/21a7455736c21887b8fefe0935012d65?s=96&d=mm&r=g","caption":"Manong"},"sameAs":["https:\/\/techkubo.com"],"url":"https:\/\/techkubo.com\/sql\/author\/manong\/"}]}},"_links":{"self":[{"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/posts\/40"}],"collection":[{"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/comments?post=40"}],"version-history":[{"count":9,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/posts\/40\/revisions"}],"predecessor-version":[{"id":1648,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/posts\/40\/revisions\/1648"}],"wp:attachment":[{"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/media?parent=40"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/categories?post=40"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techkubo.com\/sql\/wp-json\/wp\/v2\/tags?post=40"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}