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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 on theme: "DATABASE. Computer-based filing systems Information in computer-based filing systems are stored in DATA FILES. A FILE is a collection of RELATED RECORDS."— Presentation transcript:

1 DATABASE

2 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.

3 ISBNTitleAuthorPublisher 1-2456-98-09Complete Cat CareClaudia HeinikenStones 1-6789-098Build your own home Brian DeaconTaylor 1-87890-098-87Better homesJula StonesTaylor File

4 ISBNTitleAuthorPublisher 1-2456-98-09Complete Cat Care Claudia HeinikenStones 1-6789-098Build your own home Brian DeaconTaylor 1-87890-098-87Better homesJula StonesTaylor Fields

5 ISBNTitleAuthorPublisher 1-2456-98-09Complete Cat Care Claudia HeinikenStones 1-6789-098Build your own home Brian DeaconTaylor 1-87890-098-87Better homesJula StonesTaylor Record

6 ISBNTitleAuthorPublisher 1-2456-98-09Complete Cat Care Claudia HeinikenStones 1-6789-098Build your own home Brian DeaconTaylor 1-87890-098-87Better homesJula StonesTaylor Key Field

7 ISBNTitleAuthorPublisher 1-2456-98-09Complete Cat Care Claudia HeinikenStones 1-6789-098Build your own home Brian DeaconTaylor 1-87890-098-87Better homesJula StonesTaylor Key Field uniquely identifies an individual record

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

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

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

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

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

13 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.

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

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

16 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.

17 VERIFICATION Two methods, visual checking and double entry.

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