By giving an example, define the following terms: A. Coding B. Relation and Relationship
Q: When is it important to use an associative entity to express a many-to-many relationship?
A: Associative Entity is used when relationship is to be established in a relation. Like Student and…
Q: Consider the relations Student(name, Marks) and Teacher(ID, name, Salary) in which name is the…
A: According to natural join, if more than one attribute is in common then natural join selects only…
Q: Differentiate between weak entity set and strong entity set
A: Note: There are multiple questions are given in one question. According to the rule, you will get…
Q: (6) What are the 2 properties we need to keep in mind while doing decompositions to achieve a…
A: 2 properties are : ✓Lossless Decomposition: If the information is not lost from the relation that is…
Q: Draw an ER diagram expressing the total participation of an entity type “BURGER” in a binary…
A: Answer: I have given answered in the handwritten format in brief explanation
Q: Ov
A: The degree of has relationship is two.
Q: QUESTION 2 in ERD, an Entity with a partial key is named: O Partial Entity O Srong Entity O Weak…
A: Strong Entity is an entity which is not dependent on other entity and have a primary key. Its…
Q: Under what circumstances can an attribute of a relation be of variable length?
A: An attribute of a relation is the characteristic which is specified in a column. A relation is a…
Q: a. Draw ER- notation for the given elements of ER-Model. 1. Entities a. Strong Entity b. Weak Entity…
A: Strong Entity: Weak Entity: Associate Entry:
Q: Give an example of how the distinction between a candidate key and an entity type identifier is…
A: Entity Identifiers: Entity IDs are critical properties that are used to uniquely identify each…
Q: Give an example of each of the following, other than those described in this chapter, and clearly…
A: Ternary relationship: In this kind of relationship three entities participate to make a…
Q: dentify the set of functional dependencies in the relation instance CAR shown n
A: Actually, data base is used to stores the data.
Q: Q4. By giving an example, define the following terms: a. Coding: b. Relation and Relationship:
A: A set of programs which is used to store and retrieve the data is called Database. Its a collection…
Q: 'What's an unnormalized relationship? Is it a relationship according to the term relation…
A: Unnormalized relationship
Q: What does it mean to be a weak entity? Set a good example.
A: Introduction: Although an entity type should contain a key attribute that uniquely identifies each…
Q: Convert the following ER Model to Relation Model
A: Objective: We need to convert the given E-R diagram into its corresponding relational diagram. A…
Q: Transform the following E-R diagram into relations.
A: For 1:M relationship include primary key of entity whose participation is many into schema of other…
Q: Regular entity type is transformed to a relation.
A: To be determine: Regular entity type is transformed to a relation.
Q: How is a relationship between entities indicated in an ERD? Give an example using the Crow’s Foot…
A: Relationship Representation in ERD(Entity Relationship Diagram):- ER diagram or Entity…
Q: Write the relation matrix for the Boolean nor. What is the identity for nor?
A: A logical matrix, binary matrix, relation matrix, Boolean network, or (0,1) matrix is a matrix with…
Q: example
A: Ternary relations:- When three entities are involved and taking part in a relationship then it is…
Q: Define the term degree of relationship. Give an example, other than one used in this text, of a…
A: Degree of relationship :-
Q: QUESTION 4 For the following collection of entities, give the assumptions concerning the…
A: Given entities: ORDER (order#, ordDate, cust#, cName ) ORDER_PART ( order#, part#, quantity ) PART…
Q: How can we define relation? Identify the characteristics that make up a relation.
A: The table in the relational database or the relationships created between the same tables using…
Q: For each of the following pairs of related entities, indicate whether (under typical circumstances)…
A: Given: To draw a diagram for each of the relationships.a. STUDENT and COURSE (students register for…
Q: 1. Consider the relation schema which records student grades received from courses they have taken…
A: Candidate key: - It is a collection of attributes that recognize rows in a table in a unique way. It…
Q: Give an example of a relation with a unique composite key
A: A unique key is one that identifies a row in a relation uniquely. The unique key may be combination…
Q: Transform the following Entity Relationship Model into Relational Schema. DeptiD EmpiD DName Name…
A: The term "schema" refers to the organization of data as a blueprint of how the database is…
Q: Map the following ER diagram into relational schema showing foreign keys and primary keys. C1 is…
A: Entity_1(A1,A2,A3) here A1 is the primary key and A2 is a multivalued attribute. Entity_2(B1,B2,Q)…
Q: Consider the relations Student(name, Marks) and Teacher(ID, name, Salary) in which name is the…
A: Natural join joins two table based on common attribute.
Q: Build an entity-relationship diagram, deriving relations and validating relations using…
A: entity-relationship diagram
Q: Explain how functional dependencies can be used to indicate the following:• A one-to-one…
A: The functional dependency is a relationship that exists between two attributes. It typically exists…
Q: Define the term Relation?
A: Answer: A relation between two sets is a collection of ordered pairs containing one object from…
Q: E-R diagram to a set of relations.
A: Given :- An ER diagram is given in the above question Need to write the corresponding Relational…
Q: Define Unary Relationship. Give example by using Entity Relationship Diagram
A: Note: we are only allowed to solve one question in one post. I am solving the first on here. To get…
Q: Databases: Give six important properties of relations.
A: The six important properties of relations are as follows: Values are atomic. Column values are of…
Q: Explanation of three circumstances in which a surrogate key should be generated for the main key of…
A: Surrogate key: It is a key that does not have any contextual meaning but is used to identify the…
Q: Choose the resultant relation(s) after transforming the below ERD. A2 A1 A3 ENTITY A Rel O A.…
A: A relationship between two entities of a similar entity type is called a recursive relationship.…
Q: Give an example of how the distinction between a candidate key and an entity type identifier is…
A: Explain the difference between a candidate key and an entity type's identifier. The distinction…
Q: Define the connection between a relation's main key and the functional relationships between all of…
A: Introduction: As the name implies, a functional relationship expresses the influence of one variable…
Q: Give Some additional examples of strong and weak entity pairs?
A: Strong entity: It can exist without any other entity Example:Patient(Patientid, name, surname)
Q: Explain how functional dependencies may be used to indicate: • The entity sets student and teacher…
A: Justification: A functional dependence is an attribute-to-attribute link. We may get the value of…
Q: Question 1: Map the following ER diagram into a relation schema. Show the different constraints. r1…
A: For the given ER diagram , we are going to map it into relation schema . I have done it step-wise…
Q: STION 9 is used to represent the M: N relationships between two or more entities. A Mandatory B.…
A: M:N relationship: Relationships helps to connect the related information between the tables. They…
Q: Explain how functional dependencies can be used to indicate the following: A one-to-one relationship…
A:
Q: A- Determine the primary key and the foreign keys ( if exist ) for each relation : RELATION PRIMARY…
A: As per our guidelines we are supposed to answer only one question. Kindly repost other questions as…
Q: What is the degree of relationship?Give an example of a relationship of degree three
A: DEGREE OF RELATIONSHIP - The particular number of type of entities which participate into a given…
Q: Explanation of three circumstances in which a surrogate key should be established for the main key…
A: Introduction: An entity in the client's business or an object in the database that is not the…
Q: What does it mean to be a weak entity? Give an illustration.
A: An entity which can only exist when it is owned by another entity is called a weak entity. In terms…
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- Let R₁ and R₂ be the relations on X={a,b,c}, R₁={ (b,a), (c,b), (a,c) } R₂={ (a,c), (b,c)} R₁-¹= R₂ ° R₁=Draw the associations that are described by the following business rules. Include the multiplicities for each relationship. (4 marks) A patient must be assigned to only one doctor, and a doctor can have one or many patient: An employee has one phone extension, and a unique phone extension is assigned to an employee. A bookstore sells at least one book, and a book can be sold at up to 10 other bookstores around town.Draw an Entity Relationship Diagram for all of those below. (a simple one) Each lecturer is identified by a unique number, name and phone. A lecturer teaches several courses, and for each course there is a unique code and title (not necessarily unique). There might be several lecturers in a course. Each course requires one or more text books. Each text book is used in at least one course. A text book is identified by a unique ISBN, and its title, authors, publisher and year of publication are known. Each course has a unique code. The bank has many customers. Every customer has at least one account with the bank. An account may be shared by several customers. Each customer has a unique number, type, the opening date and the balance. A flight carries many passengers on a specific airplane. Each airplane has a unique number, while each flight has a code (unique), destination and origin. A passenger has a name, passport number and nationality
- TRUE or FALSE - Generalization (is-a) is the relationship established between entities to show that sub-entities that are derived from the generalized entity. Select one: a. TRUE b.FALSETalk about what weak and strong entity sets are.Define the following words with an example: A. Coding B. Relationship
- Draw the shape used in the object-based logical model of the following. a. Attributes b. Entity sets c. Links d. RelationshipsTransform the following E-R diagram into relationsConsider the following relation. Instructor (ID , name, dept – name, salary) Department (dept – name , building ,budget) Classroom (building , roomno , capacity ) Teaches (ID , course – id , sec – id , semesters ) Course (course – id , title , dept – name , credit ) Student (ID , name dept – name ,fot – ored ) Takes (ID , course – id , sec – id, semester , year, grade) Write down queries expressed in SQL. 1) Find the name of all instructors who got the highest salary in their department. 2) Find the names of all the students whose total credits are greater than 100. 3) Find the course id and grades of all courses taken by any student. 4) Find all departments that have at least one instructor, and list – the name of the departments along with the number of instructor