Database Fundamentals

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Questions and Answers

What is a primary key in a database record?

A field used to identify a record in another table

A field that contains data and has a data type and a picture

A collection of records that contain the same fields

A field or combination of fields that uniquely identifies a record (correct)

What is a foreign key in a database record?

A field that uniquely identifies a record in a table

A field that is used to relate to a primary key in another table (correct)

A collection of records that contain the same fields

A field that contains data and has a data type and a picture

What is a database?

A collection of related files or information about a subject (correct)

A table that contains related records

A record that contains related fields

A field that contains data and has a data type and a picture

What is a table in a database?

A collection of records that contain the same fields Signup and view all the answers

What is the problem with a flat database in the scenario described?

Customer details are duplicated unnecessarily many times Signup and view all the answers

What is the advantage of relating tables in a database?

It prevents data duplication Signup and view all the answers

What is a record in a database?

A collection of fields that contain data Signup and view all the answers

What is a field in a database?

A unit of data that has a data type and a picture Signup and view all the answers

What is a major advantage of relating tables in a database?

It minimizes the size of the database Signup and view all the answers

What happens when we update the address and phone number of a customer in a relational database?

We only need to update the customer's information in one place Signup and view all the answers

What is the purpose of the 'Cust ID' column in the Customers table?

To link the customer to their orders Signup and view all the answers

What is an advantage of minimizing data redundancy in a database?

It minimizes the work involved in entering new records Signup and view all the answers

What is the purpose of the Orders table?

To store order details Signup and view all the answers

What is a benefit of using a relational database?

It enhances the response time of the database application Signup and view all the answers

What is the result of relating tables in a database?

Data redundancy is minimized Signup and view all the answers

What information do we enter when creating a new order in the Orders table?

The customer's ID and order details Signup and view all the answers

What is the primary function of a database management system (DBMS)?

To create, store, organize, and access data from a database Signup and view all the answers

What is the primary purpose of a database management system?

To manage and use data from a database Signup and view all the answers

Which of the following is an example of a DBMS for desktop systems?

Microsoft Access Signup and view all the answers

What is the primary difference between Oracle Database and Oracle Database Lite?

Oracle Database is for desktop systems, while Oracle Database Lite is for small handheld computing devices Signup and view all the answers

What is the primary purpose of identifying the data required by a business?

To create files for business data Signup and view all the answers

Which of the following is an example of a DBMS for large mainframes and midrange computers?

DB2 Signup and view all the answers

What is the primary reason for using a database management system?

To manage and use data from a database Signup and view all the answers

Which of the following is an example of a popular DBMS?

MYSQL Signup and view all the answers

Study Notes

Database Concepts

A primary key is a field (or combination of fields) in a database record that uniquely identifies the record.
A foreign key is a field (or combination of fields) in a database record that is used as a primary key in another table.

Database Structure

A database is an organized collection of related files or information about a particular subject.
A table is a collection of records that contain the same fields.
A database contains one or more tables.
Each record in a table has a number of fields, and each field contains data and has a data type and a picture.

Relational Databases

A relational database is a database made up of related tables.
Relating tables in a database eliminates unnecessary duplication of data and reduces data update tasks.

Advantages of Relating Tables

Relating tables minimizes the size of the database.
Relating tables enhances the response time of the database application.
Relating tables minimizes the work involved in entering new records.
Relating tables minimizes the work involved in editing existing records.

Database Management System (DBMS)

A DBMS is a specific type of software for creating, storing, organizing, and accessing data from a database.
Examples of DBMS include ORACLE, MS SQL Server, MS Access, DB2, and MYSQL.
Each DBMS is suitable for specific types of systems, such as desktop systems, mainframes, midrange computers, and handheld devices.

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Description

Understand the basics of database systems, including primary keys, foreign keys, and tables. Learn how to identify and define records with unique identifiers.