Feb 5, 2025 · Learn all about relational databases for your OCR A Level Computer Science exam. This revision note includes information on primary, secondary and foreign keys.

Database design: If a project stores data in a database, the structure of the tables should be described and an entity-relationship diagram could be used to show how the tables are related....

Although normalisation is a widely accepted and effective approach to database design, there are alternative strategies available. One alternative is denormalisation, where the focus is on optimizing database performance by reintroducing some level of redundancy.

Relational database work by splitting data about different entities (types of things) into separate relations (tables). Each relation only contains data about one entity and relationships (connections) are made between each of the relations through the …

Features of a DBMS: Data change clash solutions: Tools in a DBMS: Query processor: handles high-level queries. It parses, validates, optimizes, and compiles or interprets a query which results in the query plan. 1st Normal Form (1NF): contains no repeating attribute or groups of attributes.

Dec 4, 2024 · Creation/modification of the database structure using this language - written in SQL. Creating a database: CREATE DATABASE <database-name> Creating a table: CREATE TABLE <table-name> (…) Changing a table: ALTER TABLE <table-name> ADD <field-name><data-type> Adding a primary key: PRIMARY KEY (field) Adding a foreign key:

Notes, flashcards, questions by topic, videos and other resources for AQA Computer Science A-level Fundamentals of Databases topic

Process of having 1 or more copies of the data in physically different locations. Study with Quizlet and memorise flashcards containing terms like relational database, Entity, Database and others.

Structured Query Language (SQL) is a programming language used to manage and manipulate relational databases. It provides a standardized way to interact with databases, allowing users to create, retrieve, update, and delete data.

As a computer science student, understanding database design is essential for your academic success. In this article, we will provide a comprehensive overview of database design to help you excel in your studies.