3.9 Data & Databases

  • Database systems: computerized mechanisms to store and retrieve data.
  • Relational databases: data is represented as tables linked based on common keys (to avoid redundancy)
In the relational model, records are “linked” using virtual keys not stored in the database but defined as needed between the data contained in the records

In the relational model, records are “linked” using virtual keys not stored in the database but defined as needed between the data contained in the records

Source: (Wikipedia)