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G4G0-1/Semester 2/Database Systems/Week 1/Week 1 Database Systems.md
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Relational Algebra - Recap

  • High level & procedural
  • Defines how to build relations

Data Manipulation Language

  • Provides set of operations
  • Data retrieval - query language
  • ex. SQL

Closure

  • Operations work on one or more relations to define another relation without changing the original
  • Both operands and results are relations, output from one operation can become the input for another operation.
  • This allows nested expressions.