Computer science · University
Tables, rows and keys · revision notes
A relation represented as rows with named columns.
Key ideas and conditions
Table
A relation represented as rows with named columns.
Primary key
A constraint identifying each row uniquely.
Foreign key
A value constrained to reference a key in another relation.
Schema
The defined structure, fields and constraints of stored data.
Explain without looking
- Give a short example showing how Foreign key would be used in practice.
- Summarize why Schema matters in the lesson “Tables, rows and keys”.
Further reading and review references
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