The use of composite attributes are avoided in relation schema when the relation schema conforms to – (a) 1NF (b) BCNF (c) 3NF (d) 4NF

Q: When moving a weak entity from the ER model to relational schema, describe what makes up the primary…

A: Weak entity means entities that doesn't have their own primary key and is completely dependent on…

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: Transform the following entity relationship diagram into a relational schema.

A: There are many different UML diagrams that serve different purposes. You can describe those details…

Q: List three conditions that suggest a surrogate key should be created for the primary key of a…

A: To be determine: List three conditions that suggest a surrogate key should be created for the…

Q: Justify how the main key of a relation is connected to all of the qualities of the relationship in…

A: Introduction: A primary key is a database characteristic that uniquely identifies a record. It's…

Q: . Generalization is when an existing relationship set participates in another relationship set.…

A: PART 1:- Generalization is when an existing relationship set participates in another relationship…

Q: Computer Science: Why normalized relations may not compromise an efficient physical implementation…

A: Inconsistently stored data can create  number of problems. A poorly designed database may provide…

Q: 4-53. Figure 4-40 O shows an EER diagram for a university dining service organization that provides…

A: The given requirements below are done  in below sections  Conversion of the given ERD into…

Q: 1. Total participation is where each entity participates in at least one relationship in the…

A: 1- True, Each entity in the entity set is involved in at least one relationship in a relationship…

Q: The type of algorithm in which decomposition of relation schema is constructed from other specific…

A: Certain algorithms are used to create relational decomposition from a set of relationships in…

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: Consider the following E/R diagram with isa relationships, in which every node represents an entity…

A: The given problem is related to Database modeling with IS-A relationship where IS-A relationship…

Q: Extract and write down the DB Schema for the following E-R Diagram. You need to write the name,…

A: Terminology used in this E-R diagram:

Q: The graphical representation of database description is called a. dynamic schema diagram b. schema…

A: The graphical representation of database description is called schema diagram so the correct option…

Q: Demonstrate that if a relation contains no property that is functionally determined by all of the…

A: Introduction   Show that if a relation has no attribute that is functionally determined by all the…

Q: ER-diagrams are high-level design of the Database. The given ER-diagram describes the Dentist…

A: Weak entities are represented with double rectangular box in the ER Diagram      office, supplier,…

Q: State two conditions that indicate when a database designer should consider using supertype/subtype…

A: A supertype is an entity which has a parent child relationship with a subtype, and it contains…

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

A: Lets see the solution.

Q: Regular entity type is transformed to a relation.

A: To be determine: Regular entity type is transformed to a relation.

Q: creating a relation database schema

A: Below is the required relational database schema:

Q: When it comes to relationships, what is the connection between the main key of a relation and the…

A: The connection between the main key of a relation and the functional dependencies among all…

Q: Given the ER diagram below, create relation schemas to capture the database design.

A: Database Management System(DBMS) is a software for storing and retrieving users data while…

Q: Map the car sale ER schema into a relation schema. Specify all primary keys (underline) and foreign…

A:

Q: Following relation schema exists : EMPLOYEE (EMP_ID, EMP_NAME, DEPT, GRADE, SALARY, AGE, ADDRESS).…

A: Answer: Given  EMPLOYEE (EMP_ID, EMP_NAME, DEPT, GRADE, SALARY, AGE, ADDRESS). Functional dependency…

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- Mapping this ER diagram to Relational Model diagram 2- Normalization of the relation scheme (1NF,…

A: Given ER diagram contain many entities and attributes. In conversion of ER diagram to Relational…

Q: Q2) Define the Entity Relationship (ER) Technique which is used in database design. Then use ER to…

A: Given: Explain Entity–relationship model (ER model).

Q: A subtype/supertype relationships are especially important in Enhanced Entity Relationship…

A: A supertype is a generic entity type that has a relationship with one or more subtypes. A subtype is…

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: Summarize six important properties of relations

A: Given: Summarize six important properties of relations

Q: Draw the Dependency Diagram that is in 3NF for each relation. For each relation show the level of…

A: Although Second Normal Form (2NF) relations have less redundancy than those in 1NF, they may still…

Q: Exercise 3.1 Define the following terms: relation schema, relational database sch domain, attribute,…

A: Explanation: Relation Schema: Relation schema describes the layout and construction of the relation,…

Q: A binary relationship that is one-to-many in an ERD is best represented by adding the primary key…

A: Lets see the solution.

Q: Show all the steps as you perform normalization for each problem up to 3NF. State your final…

A: From looking at table values since there is transitive dependency as Emp_no determines Lcode and…

Q: Deacribe relationship between primary key of a relation and the functional dependencies among all…

A: To be determine: Describe relationship between primary key of a relation and the functional…

Q: 1. All columns in a relation instance must have distinct data values.  True  False

A: A relation is composed of two parts that are instance and schema. The database is represented as a…

Q: Three instances in which a surrogate key should be constructed for the relation's primary key

A: The following are some of the reasons for creating a surrogate key: When gathering dimensional data…

Q: 13. An unnormalized table means that: a. it has repeating groups. b. it has partial and transitive…

A: Answer: (B) it has partial and transitive dependencies. A connection that contains recurring values…

Q: What is the relationship between the primary key of a relation and the functional dependencies among…

A: The fundamental rule of normalization says that each of the non-key attributes should be completely…

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: 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: Explain the use of the terms relation, tuple, and attribute.

A: Answer: In the language of database historians, term relation is used to denote a Table. Each…

Q: What is the link between the main key of a relation and the functional connections between all of…

A: Introduction: Primary and foreign keys are the cornerstones of relational database theory. Primary…

Q: Consider the following entity relationship diagram (ERD). where two entities E1 and E2 have a…

A: You have asked multiple questions so we will answer the first one for you. If you want any other…

Q: A primary key of another entity as an attribute of an entity creates: A Parent- Child connection…

A: Many-to-many relationship: A many-to-many connection exists when several records in one table are…

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: The descriptive property possessed by cach entity set is atn): A Attribute. B Instance. C Relation.…

A: The descriptive property possessed by each entity set is a(n), Then correct option is A. A.…

Q: An entity student has a derived attribute "age". When mapping ER Diagram to schema, you place…

A: We have an entity 'student' has a derived attribute "age". When mapping ER Diagram to schema, where…

Q: Consider the ER diagram for a Software Testing database below using UML class diagram symbols. Map…

A: The Answer is

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.