Which of the following is not true about a relation? Group of answer choices The cells of a relation must hold a single value. The order of the rows of a relation is insignificant. A relation is a two-dimensional table. A relation may have duplicate column names.

Q: Describe any difficulties you may have when performing join operations with the NATURAL JOIN…

A: Answer:

Q: (0 | 1) (10) * (01 | 1) + 0 ? Make a Context Free Grammar (CFG) form of the RE.

A: Answer: We need to write the context free grammar from Regular Expression so we will see in the more…

Q: What is the distinction between a PRIMARY KEY and a UNIQUE constraint

A: In Step 2,   I  have  provided  distinction between a PRIMARY KEY and a UNIQUE  KEY---

Q: Using this unnormalized table and the five functional dependencies and third normal forms. In other…

A: To find the normal forms for the given functional dependencies, we need to check each normal form…

Q: A relation may not have a super key. (a) True (b)False

A: A super key is a set of one or more attributes (columns) within a relational database table…

Q: In the context of relational databases, how does a subquery differ from a JOIN operation?

A: Managing and extracting data efficiently is crucial for effective data analysis and decision-making.…

Q: Which of the following is true? BCNF and 3NF are same. A relation in BCNF is always in 3NF A…

A: The data stored in a database can face the problem of data redundancy, which is the duplication of…

Q: Using the om database: Write a statement that displays these fields: customer’s first name…

A: Let's first understand JOIN :-   JOIN IN SQL:- Join combines the records from two tables 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: Create the Student table with following details: Data type Number Varchar(25) Field Constraint Sid…

A: We are assuming that the field book_id references a table by name of Book which has book_id as its…

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: What are the references to the main key in the same relation?

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

Q: Which of the following is the term for a cell in a relation that has no data? Group of answer…

A: When dealing with data in a database, locating and dealing with empty or non-existent values can be…

Q: A relation may not have a super key. (a)True (b)False

A: A super key is a set of one or more attributes (columns) within a relational database table…

Q: What conditions allow a relation's attribute to have a changeable length?

A: According to the question, we have to answer that what conditions allow a relation's attribute to…

Q: Under what circumstances can a relation have duplicate rows?

A: GIVEN: Under what circumstances can a relation have duplicate rows?

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: Student: studentNO, firstName, lastName, studentProgram Professor: professorID, professorProgram,…

A: SQL: SQL stands for Structured Query Language. It is used to acess and manipulate the databases.…

Q: 3. What is a DEFAULT constraint?

A: With the help of the DEFAULT Constraint, you can populate a column with a value that is always 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: Redundancy O False

A: Explanation: Decomposition is a technique for removing anomalies, inconsistencies, and redundancy…

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: 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: Question 9 : Fill in the blanks in the following table with types of index. Index field is a key…

A:

Q: do this  Following tables support the database of a shopping store. The schema contains four tables…

A: here have to determine about sql query from given problem.

Q: 13. Which one of the following uniquely identifies the elements in the relation? a. Secondary Key b.…

A: Given options -  a. Secondary Key b. Primary key c. Composite key d. Foreign key

Q: VINCE'S VINYL It is time to test Vince's database to see if it truly meets needs. It is time to look…

A: Answer is explained below in detail

Q: Which non-key attribute does the main key relate to, if any, based on the value of some other…

A: Functional dependence is the relationship between any two properties. For instance, a relationship…

Q: Queries: 1. Do a query to show name of the resource, building, category and plan to use code for a…

A: Query to show name of the resource, building, category, and plan to use code for a particular plan…

Q: In SQL, the data in a relation can be retrieved/displayed in ascending/descending order using…

A: In SQL, Ascending / Descending order is used to display the data in ascending and descending order…

Q: :When the primary key is not a composite key, the relation is said to be in at least fifth normal…

A: Lets see the solution.

Q: What three situations make it necessary to make a substitute key instead of the main key of a…

A: In relational databases, a key is a unique identifier that helps establish relationships between…

Q: What is the purpose of a primary key?

A: Primary key: Primary key refers to an attribute which is used to uniquely recognize each tuple in…

Q: Which of the foll

A: Dear Student, The answer to both of your questions are given below -

Q: Implemet the following Query on the books table from book store database. Note: the table books…

A: We use the create table command for this. This is DDL command and we don't require commit command…

Q: In the figure below, STUDENT relation has a composite primary key contains Stud_ID and Course_ID.…

A: The Answer is  in Below Steps

Q: A relation is a function only if any two first values in the pairs are the same. True or False

A: Given: A relation is a function only if any two first values in the pairs are the same. True or…

Q: What is commonly used to represent a relation? Select one: a. an index b. a schema c. a table d. a…

A: Here in this question we have asked that what is commonly used to represent a relation.and we have…

Q: the output of an operation in relational algebra? (a) An attribute (b) A relation (c) An expression…

A: ANS:  Option(b) is correct.

Q: 27. Which of the following is not a restriction for a table to be a relation? a. The cells of the…

A: Relational Model: A relation is a table that has columns and rows. Essentially, it is a system of…

Q: convert this EERD to relation.

A: Given Entity Relationship diagram contains four entities that are Publisher, Book, Author and…

Q: Each relationship is mapped into a relation?

A: Relation: Relation indicates that how the elements of the sets associated with the other elements.…