DATABASE. Computer-based filing systems Information in computer-based filing systems are stored in DATA FILES. A FILE is a collection of RELATED RECORDS.

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Presentation transcript:

DATABASE

Computer-based filing systems Information in computer-based filing systems are stored in DATA FILES. A FILE is a collection of RELATED RECORDS. Related records means that one field in a table will contain the same sort of information as a field in each of the other tables.

ISBNTitleAuthorPublisher Complete Cat CareClaudia HeinikenStones Build your own home Brian DeaconTaylor Better homesJula StonesTaylor File

ISBNTitleAuthorPublisher Complete Cat Care Claudia HeinikenStones Build your own home Brian DeaconTaylor Better homesJula StonesTaylor Fields

ISBNTitleAuthorPublisher Complete Cat Care Claudia HeinikenStones Build your own home Brian DeaconTaylor Better homesJula StonesTaylor Record

ISBNTitleAuthorPublisher Complete Cat Care Claudia HeinikenStones Build your own home Brian DeaconTaylor Better homesJula StonesTaylor Key Field

ISBNTitleAuthorPublisher Complete Cat Care Claudia HeinikenStones Build your own home Brian DeaconTaylor Better homesJula StonesTaylor Key Field uniquely identifies an individual record

DATA TYPES ALPHANUMERIC/TEXT NUMERIC (NUMBER) LOGICAL/BOOLEAN DATE

ALPHANUMERIC/TEXT Can hold any character such as a letter, number, symbol or space. Mixture of letters and numbers.

DATA TYPES ALPHANUMERIC/TEXT NUMERIC (NUMBER) LOGICAL/BOOLEAN DATE

NUMERIC (number) For integers (whole numbers) or real numbers (decimals) Fields that hold numbers only eg. 27 or 0.24, not numbers and text

DATA TYPES ALPHANUMERIC/TEXT NUMERIC (NUMBER) LOGICAL/BOOLEAN DATE

LOGICAL/BOOLEAN Can only hold two values – usually yes/no or true/false. Fields such as a Member? Paid? Where the answer is yes or no. Access shown this as a box that is ticked yes or not ticked no.

DATA TYPES ALPHANUMERIC/TEXT NUMERIC (NUMBER) LOGICAL/BOOLEAN DATE

For dates or times. Storing dates in many different formats.

VALIDATION Use validation rules to make sure the data you enter is REASONABLE. A validation rule does not stop you entering the wrong data, it stops you entering UNREASONABLE data.

VERIFICATION Two methods, visual checking and double entry.