Explain the ambiguity in the definition of the term weak entity. Explain how this book interprets this term

Q: Can the foreign key be extracted from another table that is not connected to it in entity…

A: Foreign keys are a part of table which are being sourced from some column in a different table.

Q: Can foreign keys be used with weak entities in an entity relationship diagram??

A: A entity that cannot be uniquely identified by its attribute alone is called weak entity.…

Q: Give an example of the use of effective (or effectivity) dates as attributes of an entity.

A: Effective dates as Attributes of an Entity Effective dates: Effective dates are used to design the…

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: 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: Convert the Entity Relationship diagram  to a Relational Data Model.

A: Convert the Entity Relationship diagram  to a Relational Data Model

Q: Describe the Entity-Relationship model and its function.

A:

Q: Create an Entity-Relationship Model to represent the data requirements of the problem given below.…

A: ERD for the given requirement: No of Entities: Person entity Employee Alumnus Student Staff Faculty…

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: TRUE or FALSE - Generalization (is-a) is the relationship established between entities to show that…

A: Answer: the given statement is false

Q: TRUE or FALSE - A super-entity can only have two sub-entities and no more.

A: A SUPER-ENTITY CAN HAVE MORE THAN TWO SUB-ENTITES

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: Distinguish between Data Dictionary and Entity Relationship diagram. Give examples to illustrate…

A: According to the information given:- We have to distinguish between Data dictionary and entity…

Q: Describe the differences in meaning between the terms relation and relation schema.

A: A relation schema is the combination of list of attributes and their related domain types. An…

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: The following statements are correct for. 1. Certain attributes may apply to some but not all…

A: Generalization: Based on the common features that exists among a set of entities,  they can be…

Q: 1. Complete the following table with the correspondent statements: stmple entity, weak entity,…

A: Given is a ER diagram. ER diagram consists of Entity, Relationship and attributes. Each entity has a…

Q: Explain the Entity-Relationship model and how it works.

A: Introduction: They are also known as the ERDs or ER Models, and they use a preset collection of…

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: 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: An entity that depends on an other entity to exist is called ________ entity

A: There is something known as an entity, and it is that thing. If you're working with databases, an…

Q: What is entity type?

A: Given: What is entity type?

Q: Create a rule to extract attributes from one entity type and set them in another.

A: GIVEN: Create a rule to extract attributes from one entity type and set them in another.

Q: Design an Entity-Relationship for each system described below. Use the (min,max) notation. State…

A: An entity is the relationship model which describes the interrelated things in a domain. A basic ER…

Q: Summarize six important properties of relations

A: Given: Summarize six important properties of relations

Q: Describe the entity-relationship model in detail.

A: Entity relationship models are based on the real-world entities and their relationships.

Q: The "Annual_Sal" attribute in the "BOOK" Entity type is considered as:

A: ER diagram is also called as the Entity Relationship diagram. In the above ER diagram BOOK is the…

Q: Explain the usage of attributes and the generic name for attribute in the relationship mode

A: I have provided answer in step2

Q: Are associative entities also weak entities? Why or why not? If yes, is there anything special about…

A: Associative entity: • An associative entity associates the instances of one or more entity types. •…

Q: Explain briefly four concerns that may arise when two or more relationships are combined.

A: Introduction: Four challenges arise during the merger of relations, each with a remedy.

Q: Give an example of a ternary relationship (different from any example presented herein).

A: The university or college needs a record that which teacher teaches which subject in the college or…

Q: Explain ENTITY EXTRACTION AND ER DIAGRAM

A: Entity extraction Entity extraction is also known as entity identification or entity recognition.…

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: 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 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: State a rule that says when to extract an attribute from one entity type and place it in a linked…

A: Let’s first understand what is entity type and attributes: Entity Type: A group of different…

Q: Based on the attached Figure: 1. Derive the relation schemas from the conceptual ERD in Figure 2.…

A: To derive the relation schema and provide logical ERD for derived relation schema.

Q: Create ER duagram of the foloowing information and also find entity identification, Rekationship…

A: For the given scenario the ER diagram has…

Q: Define the term entity and give an example other than those used in this book.

A: Answer: An entity may be an object with a physical existence (for example, a particular person,…

Q: Explain how the representation of weak entities differs from the representation of strong entities

A: The entity is a representation of an object, or table, or thing in a database management system.…

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…

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.