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Consider a relation schema r(A,B,C,D,E, F) and a set of functional dependencies {A-> BCD,BC->DE,B->D,D->A}
1) Compute a canonical cover for the above set of functional dependencies (show each step of your derivation with an explanation).
2)Compute the closure of AF and then determine whether or not AF is a candidate key.
Write the following procedures: woman_wants_to_enter, man_wants_to_enter, woman_leaves, man_leaves, using counters and sychronisation techniques to ensure that the correct behaviour will occur.
From information system point of view, we should take the key functions of organization and map them to strategic information. Do your companies follow this process or are steps skipped?
Write SQL queries for the books database that perform each of the following tasks: Select all authors from the Authors table with the columns in the order lastName, firstName and authorID.
Using your knowledge of Premiere Products, determine the functional dependencies that exist in the following table.
Assume you manage business activity which needs a new IS with a database. The development team is divided on which DBMS you must use. One faction wishes to use oracle,a second wants to use MtSQL, and a third wants to use SQL server.
Draw the E/R diagrams for the business rules
our current database uses dictionary-managed tablespaces. In running various performance tuning scripts, you have discovered that one of these tablespaces seems to have run out of space long before you calculated that it would.
Design a database for Ray. For each director, list his or her number and name and the year he or she was born. If the director is deceased, list the year of death.
However, the only way you can access values is through queries to the databases. In single query, you can specify value k to one of two databases.
To lock any other vertex, the transaction must have visited all the parents of that vertex and must be having a lock on one of the parents of the vertex. Show that the protocol ensures serializability and deadlock freedom.
Write the application for university admissions office. Prompt user for a student's High School Grade Point and an admission test score.
Draw an inheritance hierarchy to represent a shoe object. The base class should have derived classes of Dress Shoes, Tennis Shoes and Boots.
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