What is a unique key?

Q: What are the conditions where a foreign key must not be null.

A: GIVEN: What are the conditions where a foreign key must not be null?

Q: How do you pronounce enhanced key? What does enhanced key mean?

A: An improved keyboard is a kind of keyboard that comes standard with virtually all modern PCs. It…

Q: SOSL Query: Create a SOSL Query in salesforce to find the test keyword in the whole organization.…

A: Here we have to create an SOSL query in salesforce to find the test keyword. Here I have syntax for…

Q: The degree of a relation is the number of its columns. True False

A: Defined the given statement as true or false

Q: What is Composite Key?

A: A Composite key is a DBMS key with two or more attributes that combine to identify the Tuple in the…

Q: How is a foreign key different from a primary key?

A: Primary key is an attribute of a relation which is used to uniquely identity each tuple of the…

Q: 1. What are the four main types of keys? 2. What is the purpose of a candidate key? 3. State four…

A: Four main types of keys : Keys: A key is an attribute or a set of attributes that help to uniquely…

Q: Questions: 1- Display the IDs of all instructors who have never taught a couse and display their…

A: As per Bartleby policy I am allowed to answer specific number of questions (including sub-parts) on…

Q: Cosider the below given relational database model of Ticket Booking Application to develop an SQL…

A: What is sql? SQL is a domain-specific language used in programming and designed for managing data…

Q: Give an example of the word "foreign key

A: Please find the answer below :

Q: Which standard form mandates that no non-key attribute be functionally dependent on a portion of the…

A: Introduction: Relation R is in the second standard form (2NF) if it is in the first normal form…

Q: A composite key is a column containing unique information. a. True b. False

A: To uniquely identify a record, a composite key consists of multiple attributes. However, this is not…

Q: Each key that meets the criteria for a primary key is called functional key a O lookup key b O…

A: According to the asked question, the solution is given below with a proper explanation.

Q: How do you create primary key in excel database

A:

Q: database with Howing BUIMOTTO Table: Employees | Column Name 1 Туре I id | int | varchar I I name…

A: The SQL queried is given below.

Q: Describe how a foreign key is different from a primary key

A: Difference between foreign and primary key:

Q: The statement, „ removes the table Smaller from a DBMS. Select one: a.REMOVE TABLE Smaller; b.REVOKE…

A: Answer : d DELETE TABLE smaller

Q: Subject: Database Write the SQL statement for the following tasks. 1. Create a database for a…

A: SQL statement to create database and table given above

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: What are the different types of join?

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

Q: Employee EMPNO NUMBER(4) - Primary Key VARCHAR2(10)- Not Null VARCHAR2(9) DATE NUMBER(7,2) NUMBER(2)…

A: The Answer is in below step...

Q: Cosider the below given relational database model of Ticket Booking Application to develop an SQL…

A: An RDBMS is a type  database management system that…

Q: What exactly is a foreign key?

A: Intro Foreign keys are columns or groups of columns in a relational database table that serve as a…

Q: What is the meaning of the primary key?

A: A primary key, sometimes known as the main keyword, is a unique identifier for each entry in a…

Q: Write a detailed contrast between "Primary key" & "Composite key" in Dbms

A: Primary Key is that column of a table whose each row data is uniquely identified. It can never be…

Q: explain the difference between and outer and inner join. Use an example.

A: Join clause: The join clause is a special keyword in a SQL (Structured Query Language), which is…

Q: How can you have an Access Query field?

A: Asked:How can you have an Access Query field?

Q: A primary key is always required in a database. Select one: O True O False

A: Primary Key: The primary key constraint uniquely identifies each record in a table. Primary keys…

Q: explain the function of the FOREIGN KEY definition.

A: Functions of Foreign Key: It ensures that data is integral It is a constraint that prevents actions…

Q: Why can a foreign key have a NULL value but a primary key cannot?

A: INTRODUCTION: The term "foreign key" refers to a database key that connects two tables. The…

Q: What is a primary key?

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

Q: An index may speed up queries, but it's usually a terrible idea to create an index for every…

A: Index: Increasing the number of indexes in a database may significantly boost the pace at which…

Q: Explain the key terms Super Keys, Candidate keys and Primary Key.

A: Ans : Super Key: it is a group of single or multiple keys which is used to identifies rows in the…

Q: What is alternate, artificial, compound and natural key?

A: Alternate key: Alternate keys are just candidate keys except the primary keys. Artificial key:…

Q: 1. Using your code examples, explain what the following are and when you would use them:  A…

A: Subquery is a query within the query which returns the data that will be used in the main query. Ex:…

Q: What Exactly Are Stored Procedures?

A: INtroduction the question is about What Exactly Are Stored Procedures and here is the solution in…

Q: what is Foreign key ?

A: A FOREIGN KEY is a field or collection of fields in a table that refers to the primary key in…

Q: Which normal form requires that, no non-key attribute should functionally depend on a part of the…

A: This question says about Regardless of the typical form, no non-key attribute should depend on any…

Q: that

A: The correct answer to the given question is option (d)"GRANT"

Q: A key for this database is (Departure Time}. Enter a different key for the database.

A: The given is a sample data set which shows the details about the departure of the Airline flights on…

Q: Explain the difference between a primary key and a candidate key.

A: GIVEN: Explain the difference between a primary key and a candidate key.

Q: Open the Missing Addresses query in Design view. Add a new column to determine if a customer does…

A: Actually, file is a stored data with file name. The code has given below:

Q: The usage of indices speeds up query processing, but it's typically a bad idea to create one for…

A: Introduction: Indexing in a Database Management System (DBMS): Indexing is a time-saving way of…

Q: What kind of connection does each key have with its respective data type?

A: keys: In a database management system, a key is an attribute or a group of characteristics that…

Q: What are the main differences between Primary key and Unique Key?

A:

Q: QUESTION 2 Candidate keys O Chosen as preferred way to identify a row All of these None of these…

A: Given:

Q: 10. The minimal set of super key is called a. Primary key b. Secondary key c. Candidate key d.…

A: Please see the next step for answer.