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Level 24

Database Concepts


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Conceptual view
How the data is organised in a database.
External view
What the user sees of a database application.
Flat-file database
A database of only one table.
Hierarchical database
A database organised on a tree structure.
Physical view
How the data is stored on the secondary storage.
SQL
QL Structured Query Language – a way to program queries to interrogate, maintain and set up a database.