A Level Computer Science: Introduction to Databases
Do you want to save hours of lesson preparation time? Get your evenings and weekends back and focus your time where it's needed! Be fully prepared with presentations, notes, activities, and more.
All Computer Science topics are covered, and each module comes complete with:
Classroom Presentations
Revision Notes
Activities & Quizzes
Mind Maps, Flashcards & Glossaries
Frequently Asked Questions
What are some real-world examples of databases?
Databases are used in various industries and sectors. Examples include customer relationship management (CRM) databases used by businesses to store customer information, hospital databases for patient records, and online retail databases for inventory management.
What is the difference between a flat-file database and a relational database?
A flat-file database is a simple database system that uses a single table to store all the data, with no relationships between different tables. In contrast, a relational database organizes data into multiple tables and establishes relationships between them using keys, allowing for more efficient data retrieval and management.
What is the purpose of database normalization?
Database normalization is a process used to eliminate data redundancy and improve data integrity in a relational database. It involves breaking down a database into smaller, well-organized tables and ensuring that each table contains only relevant and non-redundant data. Normalization helps to reduce data anomalies and inconsistencies and promotes efficient data storage and retrieval.
What is a primary key in a database?
A primary key is a unique identifier for a record in a database table. It ensures that each record can be uniquely identified and accessed. Typically, a primary key is composed of one or more columns in a table and is used to establish relationships with other tables through foreign keys.
What is the role of SQL in working with databases?
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. SQL is widely used for tasks such as creating database tables, querying data, and performing complex operations like joins and aggregations.