{"id":20,"date":"2023-12-29T19:22:45","date_gmt":"2023-12-29T19:22:45","guid":{"rendered":"https:\/\/freesqlclass.com\/learn\/welcome-to-the-free-sql-class\/?page_id=20"},"modified":"2023-12-29T19:22:47","modified_gmt":"2023-12-29T19:22:47","slug":"lesson-3","status":"publish","type":"page","link":"https:\/\/freesqlclass.com\/learn\/welcome-to-the-free-sql-class\/lesson-3\/","title":{"rendered":"Lesson 3"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Review of a Entity Relations Diagram and the Select Statement<\/h2>\n\n\n\n<figure class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Learn MySQL in 2024: Lesson 3 exploring a entity relationship diagram and the select statement\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/7UHKh18FD80?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Concepts used in this lesson include:<\/h3>\n\n\n\n<p class=\"\">Database &#8211; A collection of tables<\/p>\n\n\n\n<p class=\"\">Enhanced Entity Relations Diagram (ERD) &#8211; A visual representation of a database<\/p>\n\n\n\n<p class=\"\">SQL &#8211; Structured Query Language<\/p>\n\n\n\n<p class=\"\">Data Definition Language (DDL) &#8211; A language used to create and modify a database<\/p>\n\n\n\n<p class=\"\">Data Manipulation Language (DML) &#8211; A language used to manipulate data in a database<\/p>\n\n\n\n<p class=\"\">Data Control Language (DCL) &#8211; A language used to control access to a database<\/p>\n\n\n\n<p class=\"\">Schema &#8211; A collection of tables and their relationships<\/p>\n\n\n\n<p class=\"\">Catalog &#8211; A collection of databases and their objects<\/p>\n\n\n\n<p class=\"\">Data Dictionary &#8211; A collection of data types and their properties<\/p>\n\n\n\n<p class=\"\">Data types &#8211; A classification of data<\/p>\n\n\n\n<p class=\"\">Primary Key &#8211; A unique identifier for a row in a table<\/p>\n\n\n\n<p class=\"\">Foreign Key &#8211; A unique identifier for a row in another table<\/p>\n\n\n\n<p class=\"\">Relationship &#8211; A connection between two tables<\/p>\n\n\n\n<p class=\"\">Bridge Table &#8211; A table that contains a foreign key<\/p>\n\n\n\n<p class=\"\">Associative Table &#8211; A table that contains a foreign key<\/p>\n\n\n\n<p class=\"\">Entity &#8211; A real-world object that you can store in a table<\/p>\n\n\n\n<p class=\"\">Table &#8211; A collection of rows and columns<\/p>\n\n\n\n<p class=\"\">Column &#8211; A field in a table<\/p>\n\n\n\n<p class=\"\">Row &#8211; A record in a table<\/p>\n\n\n\n<p class=\"\">Join &#8211; A SQL statement that combines two tables into one<\/p>\n\n\n\n<p class=\"\">View &#8211; A virtual table that is created from a query<\/p>\n\n\n\n<p class=\"\">Subquery &#8211; A query that is used in another query<\/p>\n\n\n\n<p class=\"\">Where Clause &#8211; A filter that is applied to a query<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Review of a Entity Relations Diagram and the Select Statement Concepts used in this lesson include: Database &#8211; A collection of tables Enhanced Entity Relations Diagram (ERD) &#8211; A visual representation of a database SQL &#8211; Structured Query Language Data Definition Language (DDL) &#8211; A language used to create and modify a database Data Manipulation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"footnotes":""},"class_list":["post-20","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lesson 3 - Free SQL Class<\/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:\/\/freesqlclass.com\/learn\/welcome-to-the-free-sql-class\/lesson-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lesson 3 - Free SQL Class\" \/>\n<meta property=\"og:description\" content=\"Review of a Entity Relations Diagram and the Select Statement Concepts used in this lesson include: Database &#8211; 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