Consider the depicted state for relation R in the table below:CWhich of the following statements regarding functional dependencies in R is correct?O Functional dependency B C may hold, but C B cannot hold.O Functional dependency C>B may hold, but B→C cannot hold.O Functional dependency A→C may hold, but C>A cannot hold.O Functional dependency C→A may hold, but A→C cannot hold. QUESTION 8The principal difference between a weak and strong entity in the Entity-Relationship model is best characterized by which of the following?Strong entities cannot have attributes.A weak entity exists in the model regardless of its affiliation with other entities, while a strong entity exists solely due to its relationship to oneor more weak entities in the model.O Weak entities cannot have attributes.A strong entity exists in the model regardless of its affiliation with other entities, while a weak entity exists solely due to its relationship to oneor more strong entities in the model.

Correct regarding functional dependencies in given relation R

Consider the depicted state for relation R in the table below: C y 2. Which of the following statements regarding functional dependencies in R is correct? Functional dependency B>C may hold, but C B cannot hold. Functional dependency C B may hold, but B C cannot hold. Functional dependency A→C may hold, but C A cannot hold. Functional dependency C-A may hold, but A→C cannot hold.

Consider the depicted state for relation R in the table below: C y 2. Which of the following statements regarding functional dependencies in R is correct? Functional dependency B>C may hold, but C B cannot hold. Functional dependency C B may hold, but B C cannot hold. Functional dependency A→C may hold, but C A cannot hold. Functional dependency C-A may hold, but A→C cannot hold.

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter5: Advanced Data Modeling

Section: Chapter Questions

Problem 8RQ: According to the data model, is it required that every entity instance in the PRODUCT table be...

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Consider the below ERD in Figure 03 of Student Enrolment system and answer the below questions. List the strong (non-weak) entity types in the ER diagram. Is there a weak entity type? If so, give its name, partial key, and identifying relationship. What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? List the names of all relationship types, and specify the (min, max) constraint on the participation of an entity type in a relationship type. Justify your choices. List concisely the user requirements that led to this ER schema design
A weak entity set may always be transformed into a strong entity set by including the primary-key characteristics of the identifying entity set in the attributes of the weak entity set. Describe the kind of redundancy that will occur as a consequence of our decision.
What does an associative entity model? a.) Associative entities model pure relationships rather than entities. b.) Associative entities model entities that are independent. c.) Associative entities model the real-world scenarios of ways to look up data. d.) Associative entities model attributes and how they are linked to entities.
A weak entity set may always be transformed into a strong entity set by including the primary-key attributes of the identifying entity set in its attributes. Explain what kind of redundancy will arise as a consequence of our decision.
Establish the objective of an entity-relationship model and explain how it is constructed
Create an Entity-Relationship Model to represent the data requirements of the problem given below. Specify the cardinalities of relationships and all-important constraints. Also mention the assumptions if you have made any. [20 Marks] A person can be an employee, alumnus or a student. For person P_id (identifier), date of birth, gender and contacts are stored. Person can have more than one contact numbers and there are no other types of person that exists. An instance of person can belong to more than one type. Date hired and salary is the unique attributes of employee. For alumnus degree is required to be stored that comprises of year and designation. Major department is the attribute of student. A student can be a graduate student or an undergraduate student but not both at the same time. No other type of student exists. For graduate student test score is stored and for undergraduate student class standing is stored. Employee can be faculty, staff or others but not both at the same…
We can convert any weak entity set to a strong entity set by simply adding appropriate attributes. Why, then,do we have weak entity sets? (a) We want to avoid the data duplication and consequent possible inconsis- tencies caused by duplicating the keyof the strong entity set.(b) Weak entities reflect the logical structure of an entity being dependent on another entity.(c) Weak entities can be deleted automatically when their strong entity is deleted.(d) All of the above.
By adding the primary-key attributes of its identifying entity set to its attributes, a weak entity set may always be transformed into a strong entity set. Describe the kind of redundancy that will occur as a consequence of our actions.
Create an Entity-Relationship Model to represent the data requirements of the problem given below. Specify the cardinalities of relationships and all-important constraints. Also mention the assumptions if you have made any. A person can be an employee, alumnus, or a student. For a person, P_id (identifier), date of birth, gender, and contacts are stored. A person can have more than one contact number and there are no other types of person that exist. An instance of a person can belong to more than one type. Date hired and salary is the unique attributes of the employee. For alumnus, the degree is required to be stored that comprises of year and designation. The major department is the attribute of the student. A student can be a graduate student or an undergraduate student but not both at the same time. No other type of student exists. For graduate student test score is stored and for undergraduate student class standing is stored. Employees can be faculty, staff, or others but not…
For each of the THREE relationships in the Entity-Relationship Dia-gram in Figure 1, explain and justify the cardinality and participationconstraints following the guidelines in lectures and exercises.
A weak entity set can always be made into a strong entity set by adding to its attributes the primary-key attributes of its identifying entity set. Outline what sort of redundancy will result if we do so.
In the Entity-Relationship (ER) model, list the many types of attributes.

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