Question: Consider the SQL Query given below. 1 0 marks SELECT Passenger. ticketno FROM Train, Passenger, Inspector WHERE Train. tno = Inspector.no AND Train.Date = '

Consider the SQL Query given below.
10 marks
SELECT Passenger. ticketno FROM Train, Passenger, Inspector WHERE Train. tno=Inspector.no AND Train.Date='05-07-2023' AND Train.to= Chennai' AND Passenger.name=Inspector.name
a. Convert the following query into relational algebra expressions. 3 marks
b. Reduce the relational algebra expression to an equivalent expression by applying the equivalence rules 3 marks
c. Draw query trees for the two relational algebra expressions. 3 marks
d. State which tree is better in terms of cost of the query execution and why? 1 mark

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