1. Explain the following term: relationally complete 3 marks 2. What is the difference between a procedural and non-procedural language? 4 marks 3. How would you classify the relational algebra and relational calculus? 4 marks 4. Explain the following term: closure of relational operations. 4 marks 5. Compare and contrast the tuple relational calculus with domain relational calculus. In particular, discuss the distinction between tuple and domain variables. 5 marks 6. Define the five basic relational algebra operations, using an example to illustrate each operation 10 marks 7. Discuss the differences between the five Join operations: Theta join, Equijoin, Natural join, Outer join, and Semijoin. Give examples to illustrate your answer. 10 marks