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A451 - Databases

Revision for OCR GCSE Computing A451 Databases

KeywordDefinition
Database Persistent and structured store of data which allows data to be stored and interrogated.
Entity A real world object about which data is stored in a database corresponding to tables in a database.
Relational Database Each entity modelled as a table with individual entities using a row of a table which are linked together using primary and foreign keys.
Primary Key Unique identifier in a database table.
Foreign Key Used to link two tables together and allow you to retrieve data from a linked table.
Redundancy Where data has been repeated unnecessarily in a database.
Validation Checks put in place to make sure data is free from error.
Data Types String, Boolean, Real, Integer
DBMS Allows database to be queried and provides facilities for creating tables, inserting data, viewing data and reporting.
Form An input screen allowing chosen data to be displayed and edited using text boxes, drop down lists, checkboxes etc.
Report An output of the data from a database showing a snapshot of the data at any given time laid out in a specified format.
Query Method of interrogating a database using a set criteria.
Created by: bmalcolmson
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