Relational Databases
New Course Coming Soon:
Get Really Good at Git
Relational Databases are the software implementation of the concepts expressed by the theory introduced by the Relational Model.
Relational Databases are the software implementation of the concepts expressed by the theory introduced by the Relational Model.
In a Relational Database, data is stored in tables.
Each table contains one or more columns, that hold data of a specific type, like strings, numbers and so on.
The set of a table and all the rules about its columns is called a schema.
Each table can define constrains upon the data that each row can contain.
Tables can reference each other, forming relationships, using foreign keys.
A Database Management System is the software that implements the database in a computer system.
Commonly, relational databases use the SQL language to let us give instructions to create a database, define its tables schema, fill tables with data, and finally query the data when needed.
Some examples of software implementing relational databases are PostgreSQL, MySQL, SQLite, Oracle and MicroSoft SQL Server.
Here is how can I help you:
- COURSES where I teach everything I know
- THE VALLEY OF CODE your web development manual
- BOOTCAMP 2024 cohort in progress, next edition in 2025
- BOOKS 16 coding ebooks you can download for free on JS Python C PHP and lots more
- SOLO LAB everything I know about running a lifestyle business as a solopreneur
- Interesting links collection
- Follow me on X