DATABASES COLLECTION OF INFORMATION FIELDS & CALCULATED FIELD DATA TYPES LINKED TABLES & FOREIGN KEY.

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Presentation transcript:

DATABASES COLLECTION OF INFORMATION FIELDS & CALCULATED FIELD DATA TYPES LINKED TABLES & FOREIGN KEY

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 NameTest 1Test 2Total Marks Simon Phoenix Hans Gruber 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.