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Given the following set of functional dependencies {cf→bg, g→d, cdg→f, b→de, d→c} defined on R(b,c,d,e,f,g)
a. Is cf→e implied by the FDs?
b. Is dg a superkey?
c. Is dg a candidate key?
d. Find a non-redundant cover.
e. Find a canonical cover.
f. What are the candidate keys?
Explain the use of constraints in functional model with suitable example. A constraint shows relationship between two objects at same time, or among various values of the sam
for the following business rules . Identify all entities, attributes, relationships, primary keys, cardinalities and constraints where appropriate 3. (9) An art museum owns a larg
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
what problems are raised by the database? why is it so controversial? why is data quality an issue?
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
What are the requirements to ensure the objectives of file management principle is realized?
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
what is cascading rollback
There are many simple and complex approaches to implement. These reports are based on some views or certain query. The following number of reports can be built. 1. The averag
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
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