What are three criteria that indicate that a surrogate key for a relation's main key should be created?

Q: The trigger below is defined on the relation T (C, D) with the primary key on the attr

A:

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

A: The answer is

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: Map the ER diagram below to a set of relations (i.e., relational schema). Underline the primary key…

A: While converting an ER diagram to relational schema, we need to take care of relationship. For many…

Q: In mathematical term Table is referred as a. Relation b. Attribute c. Tuple d. Domain

A: In mathematical term Table is referred as a. Relation b. Attribute c. Tuple d. Domain

Q: Can instances of a relation (sample data)prove the existence of a functional dependency? Why or why…

A: Lets see the solution.

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

A:

Q: Under what circumstances can an attribute of a relation be of variable length?

A: An attribute of a relation is the characteristic which is specified in a column. A relation is a…

Q: Computer science What is the relationship between the primary key of a relation and the…

A: The Answer is in step2

Q: Explain references the primary key in the same relation?

A: The primary key constraint is that each row in the relational database management system table is…

Q: In mathematical term Row is referred as a. Relation b. Attribute c. Tuple d. Domain

A: In SQL and other relationship databases,

Q: Computer science Explain how the primary key in the same relation is referenced.

A: Introduction: The primary key constraint requires that each row in the relational database…

Q: is the number of attributes/fields in a relation. a. Degree b. Cardinality O c. Tuple d. Row

A: Degree: In DBMS, degree is the number of attributes or column present in the table Cardinality: In…

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: 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: The value of the candidate key cannot uniquely identify each tuple in a relation. True O False…

A: 1. The Value of the Candidate key is used to Identify the unique tuple in the relation. Your Answer…

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: What is a well-structured relation?

A: Answer: Well-structured relation Definition: A well-structured relation is defined as the…

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

A: 1NF

Q: What exactly does it mean to define a relation? Determine the aspects that contribute to the…

A: Start: A connection is the same thing as a table with two dimensions.  It includes a certain…

Q: List all nontrivial functional dependencies satisfied by the relation of Figure7.18.

A: Given: List all nontrivial functional dependencies satisfied by the relation of Figure7.18.

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: A relation contains the points {(-10,5), (-5,1), (0,-3)}. What is the range of the relation? A…

A: Here in this question we have given three realtion and we have asked to find the range and domain of…

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: specify the primary key(or keys) and the foreign key (or keys) in each relation. I table does not…

A: A library management system is software that is designed to manage all the…

Q: database Assume that you have the following relation; R(a,b,c) a   b  c ---------- 1  A   F 2…

A: Division operator A÷B can be applied if and only if: Attributes of B is proper subset of Attributes…

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: 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: 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: . Foreign key is the one in which the ________ of one relation is referenced in another relation. a.…

A: In DBMS, keys are used to uniquely identify data in a table. Multiple keys from different tables can…

Q: Given these potential problems, what general conditions influence when to partition a relation…

A: Answer: Issues of vertical partitioning Vertical Partitioning: The separation of the logical…

Q: Identify the reasons why this relation is not in 3NF.

A: Given:'   Identify the reasons why this relation is not in 3NF.

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

A: Question given -  An E-R diagram is given. Convert this E-R diagram into relational schema.…

Q: Assume a user creates a new relation r1 with a foreign key that links to another relation r2. What…

A: Introduction: A FOREIGN KEY is like a field (or set of fields) in one database that refers to the…

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: TF (c) If a relation is not in BCNF, then it has at least three attributes in the schema.

A: If a relation is not in BCNF, then it has at least three attributes in the schema.

Q: If you assume that a relation has no duplicate data, how do you know there is always at least one…

A: We can always be sure that there is always at least one primary key. Consider the situation when…

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: 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: 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: 16.A row in a relation is calledSingle line text.   (1 Point)   17.A value of foreign key can be…

A: Since you have posted a question with multiple sub-parts, according to the company's policy we will…

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…

Q: In databases, the extension (contents) of a relation may vary, but the schema (structure) generally…

A: Justification: Consider the below table: