So the FOREIGN KEY column in a relational database table will refer to a PRIMARY KEY column in another table, defining a relation between rows in different tables.Īs Essential SQL explains, “ The primary key consists of one or more columns whose data contained within is used to uniquely identify each row in the table.” Data in primary key columns must be unique, and cannot be empty or NULL. These Primary Keys can be used as pegs of a sort that are used by other tables to define a relation to the specific row. Each row is uniquely identified by a key ( Primary Key to use SQL jargon). To put it briefly, this model structures data into tables that consist of columns and rows. The Relational Database model goes back to 1970s, as outlined by “Codd’s Twelve Commandments”. MySQL was conceived as an RDBMS (Relational Database Management System). Brief Overview of MySQL and the Relational Database Model Today it comes included by default with Ubuntu. Since it is compatible with Linux, it started being included by default in Linux distributions. One of the factors that boosted the adoption of MySQL was the GPL side of its licensing. DisplayWP has a nice chart of the minimum required MySQL version for every WordPress release.
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WordPress quickly became synonymous with the concept of open source software and so did its underlying server stack. It was written in PHP, it was using MySQL as its database, and when it appeared, its adoption caught up like wildfire. WordPress was created in 2003 by Matt Mullenweg and Mike Little, as a fork of another project. One of the factors behind MySQL’s popularity is undoubtedly WordPress, which today powers around 60% of the CMS systems or 34% of the entire web. Importing, exporting, composing complex queries, deleting and creating tables, conducting complex searches are just some of the things phpMyAdmin made possible without users ever having to use Linux terminal. It is a tool written in PHP which has made administering MySQL on LAMP servers easy. PhpMyAdmin is a web-based database administration tool that goes back to 1998, which made its way rather early into the management consoles of shared hosting providers, including cPanel. One more factor that contributed to the rise and adoption of MySQL worth mentioning is phpMyAdmin.
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With its early adoption of dual licensing - and using GNU GPL for its free version - MySQL paved the way for many other software vendors that came later. This article in Linux Journal sheds some light on its early days. Its role was key in building the internet as we know it today. Old MySQL page from 1998 (Image source: ) It was created when the market was dominated by Microsoft and Oracle’s proprietary (and pricey) solutions. MySQL is a relational database (RDBMS) which first saw the light of day in 1995, created by Michael Monty Widenius and David Axmark.
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