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For the following relation schema and set of FD's:R(A,B,C,D) with FD's B → C and B → D, do the following:
(a) Point out all the BCNF violations. Do not forget to suppose FD's that are not in given set, but follow from them. Though, it is not essential to give violations which have more than one attribute on right side.
(b) Decompose the relation, as essential, into collection of relations which are in BCNF.
One of the tenets of database development is to never permit developers to create or own objects during development. All objects are created by application owner and stored in that schema.
Based on the schema write SQL statements and provide the equivalent relational algebra expressions - relational algebra expressions return and give the equivalent SQL statements.
Suggest how to implement direct-address table in which keys of stored elements don't require to be distinct and elements can have satellite data.
Create a context level DFD. You should take your DFD to your tutorial for feedback before starting on the ER.
Using your knowledge of the college environment, determine the functional dependencies that exist in the following?
Consider relation schema r(A,B,C,D,E, F) and a set of functional dependencies {A BCD,BCDE,BD,DA}. Calculate canonical cover for set of functional dependencies (show each step of your derivation with an explanation).
Create a link list in ADT c to maintain employee information like name,empid,basic salary and address.1.add employee info to the list if the empid is valid.
Complete (i.e., reverse engineering) ER diagram below such that 4 relation schemas above are exactly result of a translation from the ERD to the relational model.
Write a program that models an employee. An employee has an employee number, a name, an address, and a hire date. A name consists of a first name and a last name.
The DBA denormalized some of the data in the Premiere Products database to improve performance. Which field or fields cause the table to no longer be in third normal form? In which normal form is the denormalized table?
Assume that relation Employee has no tuples in it initially. You are to show the simplest example you can think of where using trigger T1 will produce a different final database state than using trigger T2.
List the names of agents that placed an order for customer C003 or customer C006. List all pair of products names that are in the same city, along with their city name.
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