Summary
Summary Helpful notes for Databases
- Institution
- PEARSON (PEARSON)
A list of useful tips to know about Databases.
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Database- organised information. Access, paper basedUses: Store information on people in schools and prisons.
Benefits: easy to understand, large amounts of data can be stored, specific criteria, a-z, update
records and easy to make backups.
Databases store data in tables
Record: complete information about a person
Field: one piece of information
Data types: text, number, currency, date/time, auto number, Boolean (two choices)
Validation – To check something is correct
Primary keys
Referential integrity
Press the button “insert” on the keyboard to change the typing format
Testing
Normal – correct data
Erroneous – wrong data
Extreme - upper or lower limits of expectations that should be accepted by the system
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