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Transcript
COLLECTION OF INFORMATION
Physical Database
- Searching can be slow
- Editing is difficult
Electronic Database
+ Searching is very fast
+ Editing is very easy
ADVANTAGES & DISADVANTAGES
Physical Database
- Searching can be slow
- Editing is difficult
Electronic Database
+ Searching is very fast
+ Editing is very easy
DATA TYPES
Fields can have different data in them.
Eg 1. A name field contains the data type Text
Eg 2. A date of birth field contains the data type
date/time
Eg 3. a total field contains a calculated field.
CALCULATED FIELD
Pupil Name
Test 1
Test 2
Total Marks
Simon Phoenix
10
11
21
Hans Gruber
15
17
32
For Example:
Total Marks = Test 1 + Test 2
LINKED TABLES & FOREIGN KEY
When the tables of data are linked together
using foreign keys.
FLAT FILE DATABASE
A flat file database is any creation of
a database model (most commonly
a table) as a single file.
RELATIONAL DATABASE
• A relational database is a database that has
a collection of tables.
• The relational database is formally described
and organized.