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CSC3400 Database Systems

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The relational schema shown in Figure 1 models a very simple database whichhas two tables, namedContestandDebater, for a debating club. In a debatingcontest, one debater starts the contest and is followed by his opponent whoends the contest. Debaters are both given points by an independent jury. Thedebater with the most points wins, but draws are possible. It is assumed thatnot all the debaters inDebatertable participate the contest.The following two Foreign Keys exist in the schema between the two tables:FK Contest(starter) references Debater(name)FK Contest(ender) references Debater(name)For the relational schema shown in Figure 1, students are required to answer thefollowing five questions. Specifically,please give the answers in RelationalAlgebra expressions for Q(a)and Q(b), and give the answers in SQLfor all the ve questions using the test dataset provided(see below forthe details of the test dataset)

.(a)Give the names of the starting and the end debaters of the contests wherethe starting debater is a member of the "Plato" or "Storm" club and pre-vented his opponent from scoring any points.(It is required that thesymbol of the selection operation appear only once in the rela-tional algebra expression for this query)

(b)Give all the dates when a member of the "Storm" club participated in thedebate as either the starter or the ender.

(c)List the names of debaters who won at least one contest.

(d)List the names of clubs as well as the number of members in each club.

(e)Give the name, club and age of all debaters who have lost one or moredebates as a starter.For all the questions in this assignment, please includescreen snapshotsof theSQL query results you obtain from XAMPP server (used in the course) or otherrelational databases of your choice (such as SQL Server or Oracle, etc.). Thisis important for demonstrating your ability in running your queries on a real-life database platform. Note that a large portion of marks will be deducted ifthe snapshots are missing in your answers. The screen snapshots should capture.../2 CSC3400{Assignment 2Page 2the screen areacovering both the SQL statement and the output result.The screen snapshots should be consistent with the output of the SQL answersprovided

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