Secretly Ict Notes

In: Other Topics

Submitted By Lordgrumble
Words 806
Pages 4
Table
Tables contain data about things eg students,orders,events.
Requirements must be met for the data structure to be called a table
The table must have a unique name, each field/column must have unique name, each record/row must be unique, each data item within a field must contain only a single data item

Record
A record is a single row within a table. It is a collection of data about a single item or single event.
Field
A field is an individual data item within a record. Each field within a record should have unique name

Keys
Primary key
A primary key can be of two types which are simple and compound or composite keys
A single primary key is one which is made up of a single field only. A compound primary key is one which combines more than one field to make a unique value.
Secondary key
A secondary key is a field that is identified as being suitable for indexing the data. It is used to sort data in a different order to the primary key
Foreign key
A foreign key is used to link tables together. A foreign key is a field in one table that is linked to a primary key in another table. The data types of the fields that are linked must be the same

Relationships between entities
Entities have been defined as ‘a thing that can be distinctly identified’. The idea of an entity is central to understanding entity relationship models.
Relationships
There are three types of relationship that can be identified as existing between entities, these are , one to many, one to one, many to many.
One to one is that it is associated with only one instance of entity. One to many is the most common type of relationship between entities a single instance of an entity can be associated with many instances of another entity
Many to many, many instances of an entity can be associated with many instances of an entity

Tables and fields
A database table is made up…...

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