What is the primary benefit of using an ERD in database design?

It provides a visual representation of the database structure, which aids in understanding and communication.

It ensures data normalization and eliminates redundancy.

It allows for the direct creation of relational tables without further modifications.

It simplifies the database design process by avoiding the need for foreign keys.

What is an Entity-Relationship Diagram (ERD)?

A graphical representation of entities and their relationships.

A blueprint for building a database.

A diagram that outlines user workflows.

A flowchart showing data processing steps.

Which components are essential in an ERD?

Entities, attributes, and relationships.

Users, processes, and data flows.

Applications, servers, and networks.

In a one-to-one relationship, how many instances of each entity are associated with each other?

One instance of one entity is associated with one instance of another.

One instance of one entity is associated with multiple instances of another.

Multiple instances of one entity are associated with multiple instances of another.

Which of the following is an example of a one-to-many relationship?

Each employee belongs to one department, and each department has many employees.

Each student has one unique student ID.

Many students are enrolled in many courses.

How are many-to-many relationships typically resolved in relational databases?

By creating a supertype/subtype structure.

When drawing a supertype/subtype relationship, what does the supertype represent?

A general entity with common attributes shared by subtypes.

A specific entity with unique attributes.

A many-to-many relationship between two entities.

An attribute that can be broken down into smaller parts.

Why might you use a supertype/subtype relationship in database design?

To handle entities that share common attributes but also have distinct attributes.

To simplify complex many-to-many relationships.

To represent data at different levels of granularity.

What is the first step in transforming an ERD into relational tables?

Identifying and creating all the required indexes.

Normalizing the database to the third normal form (3NF).

Establishing foreign key constraints.

How are one-to-many relationships typically represented in relational tables?

By adding a foreign key to the table on the 'many' side to reference the primary key on the 'one' side.

By creating separate tables for each entity with no linking mechanism.

By using a composite primary key.

By creating a new table to store the relationship.

What is the process of transforming a many-to-many relationship into relational tables?

Creating a new junction table with foreign keys referencing the primary keys of the related tables.

Adding foreign keys to both related tables.

Merging the two related tables into one.

Creating a supertype for the two entities involved.

Which of the following best describes the purpose of normalization when transforming ERDs into relational tables?

To reduce data redundancy and ensure data integrity.

To create a backup of the database.

What does the DROP command do in SQL?

Deletes an entire table along with all of its data.

Removes all rows from a table without deleting the table itself.

Modifies an existing table's structure.

How can you add a new column to an existing table in SQL?

ALTER TABLE table_name ADD column_name datatype;

ADD COLUMN table_name column_name datatype;

MODIFY TABLE table_name ADD column_name datatype;

INSERT INTO table_name ADD column_name datatype;

How do you set a PRIMARY KEY constraint when creating a table?

CREATE TABLE table_name (column_name datatype PRIMARY KEY);

CREATE TABLE table_name (column_name datatype PRIMARY);

CREATE TABLE table_name (column_name datatype UNIQUE);

CREATE TABLE table_name (column_name datatype PRIMARY CONSTRAINT);

What does a FOREIGN KEY constraint do in SQL?

Links two tables together by enforcing a relationship between a column in one table and a primary key column in another table.

Enforces that all values in a column are unique.

Allows the column to accept NULL values.

Ensures that a column has a default value.

How do you set a FOREIGN KEY constraint when creating a table?

CREATE TABLE table_name (column_name datatype, FOREIGN KEY (column_name) REFERENCES other_table(other_column));

CREATE TABLE table_name (column_name datatype, FOREIGN (column_name) KEY REFERENCES other_table(other_column));

CREATE TABLE table_name (column_name datatype, FOREIGN CONSTRAINT (column_name) REFERENCES other_table(other_column));

CREATE TABLE table_name (column_name datatype, KEY FOREIGN (column_name) REFERENCES other_table(other_column));

Write the SQL command to create a table named Employees with the following columns: EmployeeID (integer, primary key), FirstName (varchar, 50), LastName (varchar, 50), Email (varchar, 100).

CREATE TABLE Employees (EmployeeID int PRIMARY KEY, FirstName varchar(50), LastName varchar(50), Email varchar(100);

CREATE TABLE Employees (EmployeeID int PRIMARY, FirstName varchar(50), LastName varchar(50), Email varchar(100));

Write the SQL command to add a new column DateOfBirth (date) to the Employees table.

ALTER TABLE Employees ADD DateOfBirth date;

MODIFY TABLE Employees ADD DateOfBirth date;

UPDATE TABLE Employees ADD DateOfBirth date;

INSERT INTO Employees ADD COLUMN DateOfBirth date;

Write the SQL command to insert a new record into the Employees table with the following values: EmployeeID = 1, FirstName = 'John', LastName = 'Doe', Email = 'john.doe@example.com'.

INSERT INTO Employees (EmployeeID, FirstName, LastName, Email) VALUES (1, 'John', 'Doe', 'john.doe@example.com');

ADD INTO Employees (EmployeeID, FirstName, LastName, Email) VALUES (1, 'John', 'Doe', 'john.doe@example.com');

UPDATE Employees SET (EmployeeID, FirstName, LastName, Email) = (1, 'John', 'Doe', 'john.doe@example.com');

MODIFY Employees (EmployeeID, FirstName, LastName, Email) VALUES (1, 'John', 'Doe', 'john.doe@example.com');

Write the SQL command to create a table named Orders with the following columns: OrderID (integer, primary key), OrderDate (date), CustomerID (integer, foreign key referencing Customers(CustomerID)).

CREATE TABLE Orders (OrderID int PRIMARY KEY, OrderDate date, CustomerID int FOREIGN KEY REFERENCES Customers(CustomerID));

CREATE TABLE Orders (OrderID int PRIMARY, OrderDate date, CustomerID int, FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID));

Write the SQL command to alter the Orders table by adding a new column ShipDate (date).

ALTER TABLE Orders ADD ShipDate date;

MODIFY TABLE Orders ADD ShipDate date;

INSERT INTO Orders ADD COLUMN ShipDate date;

UPDATE TABLE Orders ADD ShipDate date;

Write the SQL command to drop the ShipDate column from the Orders table.

ALTER TABLE Orders DROP COLUMN ShipDate;

DELETE COLUMN ShipDate FROM Orders;

REMOVE COLUMN ShipDate FROM Orders;

ALTER TABLE Orders REMOVE COLUMN ShipDate;

Write the SQL command to insert a new record into the Orders table with the following values: OrderID = 101, OrderDate = '2024-06-01', CustomerID = 1.

INSERT INTO Orders (OrderID, OrderDate, CustomerID) VALUES (101, '2024-06-01', 1);

ADD INTO Orders (OrderID, OrderDate, CustomerID) VALUES (101, '2024-06-01', 1);

UPDATE Orders SET (OrderID, OrderDate, CustomerID) = (101, '2024-06-01', 1);

MODIFY Orders (OrderID, OrderDate, CustomerID) VALUES (101, '2024-06-01', 1);

Database Design Concepts Quiz

Quiz

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Other

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University

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Practice Problem

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Easy

Casey Gordon

Used 1+ times

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36 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes an Entity-Relationship Diagram (ERD)?

A flowchart that outlines the steps in a business process.

A diagram that shows the relationships between entities in a database.

A type of data flow diagram that represents the data flow within an organization.

A chart used to display the organization of a company's hierarchy.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a one-to-one relationship in the context of database design?

A relationship where one entity instance is associated with multiple instances of another entity.

A relationship where one entity instance is associated with exactly one instance of another entity.

A relationship where multiple entity instances are associated with multiple instances of another entity.

A relationship where many instances of one entity are associated with many instances of another entity.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is true about many-to-many relationships?

They cannot be represented in an ERD.

They require a junction table to be implemented in a relational database.

They are the same as one-to-many relationships.

They can be directly transformed into relational tables without any modifications.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is a supertype/subtype relationship depicted in an ERD?

Using a dashed line between entities.

A diamond shape connected to multiple entities.

With a triangle symbol pointing from the supertype to the subtypes.

By a rectangle that contains all possible subtypes within it.

OPEN ENDED QUESTION

3 mins • 1 pt

In transforming an ERD to relational tables, how is a one-to-many relationship handled?

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When transforming an ERD that includes a supertype/subtype relationship into relational tables, what is a common approach?

Create separate tables for the supertype and each subtype, with the subtype tables referencing the supertype table.

Merge all attributes into a single table, discarding the distinctions between supertype and subtypes.

Use a single table for the supertype and include a column for each possible subtype.

Create a single table that includes all attributes and an additional type field to differentiate subtypes.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements is true regarding the transformation of ERD into relational tables?

All relationships in an ERD are transformed into foreign keys in relational tables.

Only many-to-many relationships require the creation of additional tables.

Supertype/subtype relationships always result in a single table in the relational schema.

ERDs do not need to be transformed when using object-oriented databases.

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