1. Database Use and Structure
8.4 Databases
Database Use and Structure

2. What is a Database?
A database is a collection of data stored in a logical way.
This data can be accessed, organised, sorted through and displayed in a range of ways.
You will use a wide number of databases on a daily basis without ever realising it. Usually a database will store data on one specific subject or topic.

3. Common Databases
Databases are all around us and we use them everyday without thinking about it.
Think about your mobile phone. There is a database which stores all of your contacts. These may be sorted by surname to make them easier to find.
The school keeps details on all its students. When a register is taken your attendance mark is stored in a database.
Your local video store will have a database of all the titles they have on offer. This database will tell them when the title was last rented and by who.

4. Database Structure There are three main parts to a database
The database is made up of one or more tables. A table stores data on a particular group. The schools database may have a table for its pupils and another for the staff.
Each one of the tables is made up using fields. A field stores a piece of information on each record. Examples include Name, Address, Postcode, gender etc.
A record is a collection of fields on one subject.

5. Structure Continued

6. Advantages of Databases
All information can be centralised (kept in one place)
Electronic databases can be accessed by multiple people at the same time. Think about large businesses with multiple staff.
Electronic databases mean increased security
Faster searching, filtering and sorting of data.
Data can be presented in different forms.
Data can be checked on entry using validation and verification

7. Disadvantages of using Databases
Databases can be hard to design and create
Special hardware and software can be required
Special training may be needed for staff