A marine biology research station uses a relational database to monitor the migratory patterns of tagged whale sharks. The primary table, SightingLogs, stores telemetry and location data for each individual encounter.
Explain the purpose of a primary key in a relational database table such as SightingLogs.
38 exam-style questions on AQA GCSE Computer Science Relational databases. Each one has a worked solution and a mark scheme showing where the marks go.