Understanding Oracle Constraints: Beginner-Level Quiz

Oracle Constraints Quiz

Welcome to the "Oracle Constraints" quiz! This quiz is designed to test your knowledge of the various types of constraints in Oracle Database, including primary keys, foreign keys, unique constraints, and check constraints. You'll explore how these constraints enforce data integrity and relationships within your database. Whether you're preparing for an interview or looking to solidify your understanding, this quiz will help you assess your grasp of essential concepts in database management. Let’s get started!

1 / 20

Which of the following can be addressed by enforcing a referential integrity constraint?

Certain fields are required (such as the email address, or phone number) before the record is accepted

Information on the customer must be known before anything can be sold to that customer

All phone numbers must include the area code

Then entering an order quantity, the user must input a number and not some text (i.e., 12 rather than ‘a dozen’)

2 / 20

Which one of the following uniquely identifies the elements in the relation?

Foreign key

Secondary Key

Composite key

Primary key

3 / 20

Which of the following constraints are TRUE to be put in Password system?

An eight-character minimum password is required.

One uppercase character must be included in the password.

At least one symbol must appear in the password.

All of the above

4 / 20

_______ integrity is achieved by using a foreign key.

Domain Integrity

Entity Integrity

Referential Integrity

User-defined Integrity

5 / 20

You can also ____ the existing tables by using the UNIQUE constraint.

Delete

Drop

Change

Modify

6 / 20

By constraining a SQL statement, we limit the ____ according to certain conditions or restrictions.

Database

Table

Row

Column

7 / 20

Which of the following is/are type of SQL Constraint?

Table Level

Column Level

Both A and B

None of the above

8 / 20

A unique constraint ensures that a column or set of columns in a table contains unique values. True or False?

True

False

9 / 20

__________ express the number of entities to which another entity can be associated via a relationship set.

Relational Cardinality

Mapping Cardinality

Participation Constraints

None of the mentioned

10 / 20

________ is preferred method for enforcing data integrity.

Cursors

Constraints

Triggers

Stored Procedure

11 / 20

Establishing limits on allowable property values, and specifying a set of acceptable, predefined options that can be assigned to a property are examples of:

Data integrity constraints

Method constraints

Attributes

Referential integrity constraints

12 / 20

What is TRUE about DEFAULT constraint?

An index can be created on the table using the DEFAULT constraint.

In the event of a DEFAULT constraint being applied to a table's column without a user specifying the value to be inserted when that constraint was applied, the default value that was specified when the constraint was applied will be put into that column.

The value will first be checked for certain conditions before inserting it into the column when a DEFAULT constraint applies to a column in the table.

None of the above

13 / 20

An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A.

One-to-many

Many-to-one

One-to-one

Many-to-many

14 / 20

Which constraint can be define only at the column level?

Unique

Primary key

Not null

Check

15 / 20

Data integrity constraints are used to:

Improve the quality of data entered for a specific property

Ensure that duplicate records are not entered into the table

Prevent users from changing the values stored in the table

Control who is allowed access to the data

16 / 20

Select the correct constraint in SQL?

DEFAULT

CHECK

NOT NULL

All of the above

17 / 20

In addition to eliminating all ____ integrity constraints, CASCADE CONSTRAINTS will also drop all other constraints.

Sequential

Referential

Relational

Consecutive

18 / 20

Which of the following is TRUE about UNIQUE constraint?

Unique values will always be present in the column containing the unique constraint.

In columns that are subject to the UNIQUE constraint, duplicate values are not allowed.

A single table can have more than one unique constraint, since it can be applied to more than one column.

All of the above

19 / 20

NULL means _______?

Empty

ZERO

-1

20 / 20

When a table's column is declared as NOT NULL, no record in the table can have an empty value for that column. True or False?

True

False

Your score is

The average score is 60%

Oracle Constraints entail rules applied to database tables to enforce data integrity and consistency. These include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK. Constraints are essential for maintaining structured and reliable data within the database.

This quiz is designed to test your foundational understanding of Oracle constraints.

Best of luck!