Cross word TE - 3

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Across
  1. 1. In a table this represents a relationship among a set of values
  2. 3. It is used to refer to a rows
  3. 6. It is preferred method for enforcing data integrity
  4. 7. It is most commonly used operation in relational algebra for projecting a tuple
  5. 9. for each attribute of a relation, there is a set of permitted values called____
  6. 10. used to refer attribute
Down
  1. 1. In RAD model R stands for____
  2. 2. In QFD,F stands for____
  3. 4. Logical design of database
  4. 5. This model is not suitable for accommodating any changes
  5. 8. It is not a phase of prototyping model
  6. 9. It is not a step of requirement engineering