Advanced Database Management Systems - IT Assignment Help

Assignment Task

Question 1 The relational schema shown below is part of a banking system. The contents of the Deposit and Branch tables are also shown below. Deposit (Branch, Acc-No, Cust-Name, Balance) Loan (Branch, Loan-No, Cust-Name, Balance) Branch (Branch, Assets, Branch-County) Customer (Cust-Name, Cust-County, Branch)

a) Derive the result of the following relational algebra queries:

(i) ? Cust-Name (?Balance <=400 ? Branch = “Rochdale” (Deposit)))

(ii) ?Branch (?Branch-County ≠ ‘Warwickshire’ ? Assets <= 1750001 (Branch)) 

b) Produce a relational expression that shows the account number and balance for all customers at the Rochdale branch with a balance greater than £400.

c) Give an outline of the main features of Relational Calculus.

d) Give a definition of query optimisation and outline how relational algebra can be used in the process of query optimisation.

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