What are the requirements that two relations must satisfy in order to be considered union compatiblity?why ar those requirements necessary ?

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: Provide examples of relations that could have more than one candidate key.

A: Candidate key A candidate key is recognized as a "set of attributes" (or fields) with the ability…

Q: Consider the below given ER diagram: El E2 E3 RE The minimum number of relations required for the…

A: Introduction :We have given an ER diagram , we have to calculate the minimum numberof relations…

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

A: Relations :  =>   Relation is sometimes used to refer to a table in a relational DB. =>   It…

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: 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: What is the reason for normalised relations may not compromise an efficient physical implementation…

A: Normalized relations may also not jeopardize the efficiency of the simple geometric structure, as…

Q: Consider the below given ER diagram: El RI R2 RS R4 R3 The minimum mumber of relations required to…

A: Introduction :Given , An ER diagramWe have to find the number of relations required to represent the…

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

A: There will be two relational schema for above ER diagram : 1) Course(Code,Name) It has primary keys…

Q: Consider the following E-R diagram: E1 RI E2 R4 R2 R5 EA R3 E3 What is the minimum number of…

A: Introduction    Given, An ER diagram . We have to calculate the minimum number of relation required…

Q: Based on the set of 3NF relations derived in (b), draw a complete entity relationship diagram (ERD)…

A: Employee Record ( Name, Emp Number, Address, DOB) Course Attended ( Number, Description, Location,…

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: 1. Write its relational schema and draw its dependency diagram. 2. Label all transitive and/or…

A: DINNER ( MEMBER_NUM, MEMBER_NAME, MEMBER_ADDRESS, MEMBER_CITY, MEMBER_ZIPCODE, INVITE_NUM,…

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

A: 1NF

Q: What is the reason that normalized relations may not compromise an efficient physical implementation…

A: Normalized relations don't always jeopardize the performance of the simple geometric structure,…

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: 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: Summarize six important properties of relations

A: Given: Summarize six important properties of relations

Q: relationship between the entities(did not show the relationship) and the contraints

A: The solution for the above-given question is given below:

Q: 1. Identify the candidate and foreign keys in the schema. Explain how the entity and referential…

A: Identify the candidate and foreign keys in the schema: CENTER TABLE - an independent table with…

Q: 1.Consider the relation schema given in below fig. Design and draw an ER diagram that capture the…

A: A diagram that is used to describe a structure of a database is called Entity Relation Diagram. A…

Q: What is a relation, exactly? Determine the traits that make up a relationship.

A: A relation is a table with two parts. It shows how many rows (called "tuples") and columns there are…

Q: Using the Entity Relationship Diagram you have created, create the tables and insert the values…

A: Below are the create and insert queries:

Q: What characteristics do tables that conform to the concept of well-informed relations have? [ 1 b.…

A: let us see the answer:- Since it is a multi-part question we are answering the first 2 questions for…

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: Based on the above relational schema you are required to draw the Entity Relationship Diagram (ERD).…

A: ER Diagram

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: Please TYPE IF POSSIBLE OR WRITE CLEARLY Consider a relation X with six attributes WYSMFE where WS…

A: 1. Primary key for the given relation is (W, S)  The FDs S -> YME This is partial functional…

Q: On which side of a many-one connection does the main key of one entity serve as a foreign key? On…

A: Given that: On which side of a many-one connection does the main key of one entity serve as a…

Q: Part 3: Denormalization – Pick one of the three common relationship types that often give an…

A: DENORMALIZATION: denormalization, the opposite of normalization to increase the performance…

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: What concept is defined by the following definition?  ”A set of entities of the same type that…

A: Please find the answer below :

Q: Use the technique of normalization to validate the structure of your relational schema. Demonstrate…

A: Answer: We need to write the 3-Normal form with some examples. Hence we have explain in more details…

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: An ERD has m number of entities (strong, weak, parent, child all combined) andn number of…

A: Data structure diagrams (DSDs) are similar to ER diagrams in that they focus on relations between…

Q: Show the SQL statements for creating relations corresponding to the entity sets and relationships.…

A: The following SQL statements create the corresponding relations.

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

A: Three conditions that suggest a surrogate key should be created for the primary key of a relation :…

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: 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: :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 E/R diagram with isa relationships, noting that attribute b is the key of R.…

A:

Q: the definition of a relational database, explain what is meant by "normalized relations" ?

A: Normalisation is the process of removing redundancy and anamolies from database.

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.