Mapping: Create relational schemas for the ER diagram given below. Indicate clearly the prin and foreign keys of each relation.

Q: Explanation of three cases when it makes sense to create a secondary key instead of the main one in…

A: The three cases when it makes more sense to create a secondary key instead of using the main key in…

Q: What are the conditions under which an attribute of a relation may have a changeable length?

A: Introduction: An attribute is defined as a trait or characteristic found in a person, a place, or an…

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: Why do the functional dependencies among a relation's attributes have to do with the primary key of…

A: Dear Student, The detailed answer to your question is given below -

Q: A relation cannot have: Multi-values attributes Several super-keys O Composite attributes Attributes…

A: Answer:

Q: What problems might arise from vertically partitioning a relation?

A: Issues of vertical partitioning Vertical Partitioning: The separation of the logical_ relation…

Q: Department: (DID, Department_Name, City, budget) Works IN: (EID, DID, Annual_Salary, Start_Date)…

A: T1: π(Employee_name, Annual_Salary) (Employee ⨝(Employee.EID = Works_IN.Employee_ID) Works_IN…

Q: [   slide-15 .png  ] Q1. Please write SQL codes to create below member database table   based on…

A: A relational database contains tables. Tables are also known as relations and they contain rows and…

Q: What does it mean to be related? How do you define a relation's properties?

A: Relation is a property of set that we study in discrete math. Two set be said as related when it…

Q: The Car Maintenance team also wants to store the actual maintenance operations in the database. The…

A: DELETE CASCADE: - When we constitute a foreign key using this option, it deletes the referencing…

Q: Courses(CNum, topic, fee, facID) Faculty(FacID, LName, Office, Dept) Give a relational algebra…

A: Answer: I have given answered in the brief explanation

Q: Qno 2: Normalize the following Customer-Order Relation up to 3rd Normal Form, but step by step show…

A:

Q: How does a relation's primary key affect its attributes' functional dependencies?

A: Introduction: Relational databases are widely used in modern computing systems to store and manage…

Q: Convert the following ERD to relation schemas. EXPLAIN your answer. Dept Course number Name Name Id…

A: The Answer is

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

A: The relational schema has been given in step 2.

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

A: The processes to generate the relational schemas for the provided Entity Relationship diagram are…

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: What data types would you use for the attributes in this entity? How would you code a CREATE TABLE…

A: In a database management system (DBMS), an attribute is a piece of data that describes an entity.…

Q: FK (if any) for each relation. Apt.# City St fname Iname name Ad id id name address (0,1) (1,1)…

A: Here relationship between Administrator is 1:1 where participation of Administrator is partial and…

Q: The degree is the number of tuples in a relation. Select one: a. False b. True

A: Relational Database: Table is called as relation or file. Row is called as tuple. Column is called…

Q: A foreign key can refer to only the candidate key of another relation. (a) True (b)False

A: A foreign key is a field or a set of fields (columns) in a relational database table that is used to…

Q: What does it mean to be related? How do you define a relation's properties?

A: Introduction: A relation is a table that has two dimensions. It is divided into rows (tuples) and…

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: Draw the arrow diagram for the following relation. The domain of relation is a group of four friends…

A: SOLUTION -     Given that in a given domain which consists of four friends, there is a relation H.…

Q: Identify FIVE properties that a relation must have in the relational model.

A: A relational database is a type of database that organizes data into tables with rows and columns,…

Q: Why would you use a surrogate key instead of the main key for a relation?

A: In database management systems, surrogate keys and main keys are both used to uniquely identify…

Q: What are three cases when a surrogate key might be used in place of a relation's main key?

A: A surrogate key is an artificially generated or assigned unique identifier that is used to uniquely…

Q: SQL allows a foreign-key dependency to refer to the same relation, as in the following example:…

A: Answer:-

Q: Identify if the following relation is in 1NF: STUDENT(StudentID, FirstName, LastName, (CourseID,…

A:

Q: What are three reasons to create a surrogate key for a relation's main key

A: Surrogate key: It is a key that has no contextual significance but is utilized in data analysis to…

Q: When both relations are not physically sorted but have an index on the attributes being combined, a…

A: In this question we have to understand the term provided where when both relations are not…

Q: What is the purpose of denormalization? Whymight you not want to create one physical tableor file…

A: Denormalization means it is a process adding one or more redundant data to one or more tables. The…