Explain three conditions that suggest a surrogate key should be created for the primary key of a relation.

Q: Use normalization to decompose a relation with anomalies into well-structured relations?

A: Yes, Normalization are used to decompose a relationship with anamolies into a well structured…

Q: Create relational schemas for the ER diagram given below. Indicate clearly the primary and foreign…

A: The answer is

Q: Using the assumptions you stated in your answer to question 2.32, what are the determinants of this…

A: Given: Using the assumptions you stated in your answer to question 2.32, what are the determinants…

Q: QUESTION 18 Match the term that best fits its definition. v Alternate Key A A minimal set of…

A: Find Your Matching Table Below

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: A attribute in a relation is a foreign key if the _______ key from one relation is used as an…

A: A foreign key is a key used to link two tables together. This is sometimes also called as a…

Q: # Question 1. Please select the correct statement(s) regarding a key constraint for a relation. An…

A:

Q: 1)A tuple is a named column of a relation. True or alse 2)Each attribute in a relation has a…

A: Since you have asked multiple question, we will solve the first 3 questions for you. If you want any…

Q: :One of the following statements is true regarding normalization .Normalization is a top-down…

A: Lets see the solution.

Q: Suppose that you are given a relation R = (A,B,C,D,E) with the following functional dependencies:…

A: Here, from the given functional dependency we have, {BC}+ = ADEBC {D}+ = BD   Hence here {BC} is the…

Q: Explain the relationship between the primary key of a relation and the functional dependencies that…

A: Introduction: A primary key is a database characteristic that uniquely identifies a record.

Q: In what normal form is the LOTS relation schema in the Figure with respect to the restrictive…

A: The relationship data, if it is in a first NF and all non key depend on primary attribute. Then the…

Q: Indicate all the functional dependencies and the normal form for each relation

A: The functional dependencies are the unique relationships between the attributes. For the table given…

Q: Describe the meaning of a Functional Dependency between attributes in a single relation A1 → A2. Use…

A: Functional dependency determines relationship between attributes of table dependent on each other.…

Q: List the relation’s superkey(s) List the relation’s candidate key(s) Explain the Entity integrity…

A: The given is a relation named Student which holds the attributes to store the details about a…

Q: 2. What is the minimum level of normal form for a relation with only one non- prime attribute?

A: 1NF

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: 1. Transform the diagram on the previous page into a relational model. All the relations in the…

A: Relational model from given entity diagram, Underline attribute is primary key Customer(name:string,…

Q: I) Map the ER diagram created in exercise E.2.2a into a relational schema. II) Show several records…

A: Solution:   a.        DOCTOR Relation   DoctorID DoctorName DoctorYrMDGraduation OLID…

Q: B. In your own words, explain why one cannot consider every table as a relation. C. All relations…

A: A table is a collection of related data held in a table format within a database. It consists of…

Q: Consider the following relation with functional dependencies as shown below. R{sno, sname, age,…

A: Answer to the given question: choice(a) First Normal Form The given relation will be in first normal…

Q: Question 3. If relation R declares some attribute(s) as a Foreign Key (FK) referencing to another…

A: Foreign key is used to defined relationship between table. A foreign key of table R is refer to…

Q: Consider the following relation with functional dependencies as shown below. R{sno, sname, age, cno,…

A: Given dependencies are: A -> B, CC -> FD -> E Given relation: R(A, B, C, D, E, F)   Since…

Q: 1. The table above is not in First Normal Form (1NF). Why? 2. Transform the Table 1 into 1NF. 3.…

A: The given problem has a table with sample data values in it and requirement is to normalize the…

Q: What is an unnormalized relation? Is it a relation according to the definition of the word relation?

A: In a database management system, a relation is a collection of interconnected tables or a single…

Q: QUESTION 6 Consider the following functional dependencies for a relation R(A, B, C, D) A -> (B, C,…

A: A super key whose any proper subset is not super key is called candidate key.   closure table : (A)+…

Q: en the candida

A: Solution - In the given question, we have to discuss the differences between the candidate keys and…

Q: Consider two relations Order and Product with the schema Order (Oid, Odate, Pid, qty) and Product…

A: Candidate key contain unique and non null values. It uniquely identifies rows in a table. Every…

Q: Authorname, Book_type, Listprice, Author_affil, Publisher) Author_affil refers to the affiliation of…

A: (a) Explanation: =>Let say relation BOOK =R, Book_title = A, Author_name = B, Book_type = C,…

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: the importance of normalization that EER conversion leads to a normalized set of relations.

A: Required: What is the  importance of normalization that EER conversion leads to a normalized set of…

Q: Consider the follow relations’ schemas to answer the following questions:  Student (sid, name,…

A: Student 1000 blocks Book 5000 blocks BorrowedBook 15,000 blocks  -->Record size R in…

Q: Candidate key is an attribute or set of attributes that uniquely identifies a tuple within a…

A: As per given by the student to submit true or false im just giving the answer as per the question

Q: Create ERD of a hospital with these requirements "and then" write relation schema (underline primary…

A: We need to solve: Create ERD of a hospital with these requirements "and then" write relation schema…

Q: I) Map the ER diagram created in exercise E.2.2a into a relational schema. ЕЗ.5а II) Show several…

A: Relational Schemas: E3.5a: Mandatory participation on the 1 side: There are no nulls in the DOCTOR…

Q: Any relation must have at least ONE Select one: a. Foreign Key b. Composite key  c. Alternate key…

A: A relation basically is a table containing rows of some properties called columns. So there must be…

Q: Informally describe the conditions to be met for a relation to be in Second Normal Form. In terms of…

A: Second Normal Form, it must satisfy two conditions: The table should be in the First Normal Form.…

Q: :One of the followings is NOT a step to transforming an ERD into normalized relations normalize the…

A: Answer is denormalize the relations .b

Q: Consider the following relation for published books: BOOK (Book title, Author_name, Book type, List…

A: Let's discuss schema and dependencies: Schema given : Book(Book title , Author_name , Book type…

Q: What problems can arise from vertical partitioning of a relation and general conditions influencing…

A: Given: What problems can arise from vertical partitioning of a relation and general conditions…

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.