1. Database Concepts
Relational Databases
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2. All – most - some ...
ALL : Identify the differences between flat file and relational databases
MOST : Explain how to use Primary Keys and Foreign Keys
SOME : Describe how databases use Indexing
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3. Click to explore more about the Databases …
What is a Database?
Primary & Foreign Key
Thought board
Relational Databases
Design a Database

4. What is a Database ..?
A database is just a collection of data A simple database could be a computing text book
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5. What is a Database ..?
Data about each topic is stored in the book The data is organised into chapters You can search for a topic using the content and index pages
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6. What is a Database ..?
Organisations have data that they need to store, collate and analyse 30 years ago this data would have been stored in a filing cabinet
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7. What is a Database ..?
Modern organisations use computer systems to store, collate and analyse data These systems are called Databases
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8. Relational Databases …
A relational database …
Stores data …
In different tables, and …
The tables are joined with a relationship
Most relational databases use a language called Structured Query Language (SQL)
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9. Relational Databases …
Different types of relationships can be created … One – to - One
tblNames
tblContactDetails
One person in tblNames can have One contact detail in tblContactDetails
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10. Relational Databases …
Different types of relationships can be created … One – to – Many
tblNames
tblContactDetails
One person in tblNames can have Many contact detail in tblContactDetails
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11. Primary & Foreign Key …
Relationships are created between the Primary Key in one table and the Foreign Key in another table
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12. Primary & Foreign Key …
Relationships are created between the Primary Key in one table and the Foreign Key in another table
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13. Flat File Database … tblNames PK FirstName Surname Key Steve Jones 001
Bill
Gates
002
Stephen
Hawkins
003 FK
tblContactDetails
Mobile
Telephone
Person
Key
001
004
002
005
003
006
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14. Can you draw a diagram to show the relationships between each table
Your Turn …
Suppose we are going to create a relational database of students and subjects Each student can study up to 5 classes A teacher can teach 3 classes
Where will you start?
Can you draw a diagram to show the relationships between each table
Teachers Notes …
Use the database planning tables to help plan the structure of this database
This can be linked into the next lesson on relational databases
You may want to use A3 sheets of paper to allow students to draw the relationships between different tables
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15. Thought Board … A database is just a collection of data
Database key terms …
Data
Table
Record
Field
Field Name
Flat File and Relational Databases
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