Relational Database Programming ~ Swahili ICT Tutorials

Relational Database Programming

In this series, we explore relational database programming using various database management systems. We will focus on PostgreSQL, MySQL, and SQL Server.

A relational database is a type of database that organizes data into tables, where each table consists of rows and columns. The relationships among the tables are defined by establishing connections between the data elements. In a relational database, data integrity is maintained through various constraints, such as primary keys, foreign keys, and unique constraints. This ensures that the data stored in the database remains consistent and accurate over time.

One of the key features of relational databases is the ability to perform complex queries to retrieve specific data from multiple tables. This is done using Structured Query Language (SQL), which is a standardized language for managing and manipulating relational databases. SQL allows users to write queries to retrieve, insert, update, and delete data in a relational database. Queries can range from simple SELECT statements to more advanced operations involving joins, subqueries, and aggregations.

For example, a typical SQL query might retrieve all the employees who work in a particular department and earn a salary above a certain threshold. This query would involve joining the employee table with the department table based on a common key (e.g., department ID), filtering the results based on salary, and then returning the relevant employee information. Relational databases provide a powerful and flexible way to store and manage large volumes of structured data, making them ideal for a wide range of applications across various industries.

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