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

Drop Table cannot be used to drop a table referenced by a _________ constraint.

Foreign Key

Local Key

Primary Key

Composite Key

2 / 20

Primary key constraint can contain null value, But Unique key constraints should be not null. True or False?

True

False

3 / 20

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

Table Level

Column Level

Both A and B

None of the above

4 / 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

5 / 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

6 / 20

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

True

False

7 / 20

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

Delete

Drop

Change

Modify

8 / 20

Constraints are not specified to restrict entries in the relation. True or False?

True

False

9 / 20

_______ integrity is achieved by using a foreign key.

Domain Integrity

Entity Integrity

Referential Integrity

User-defined Integrity

10 / 20

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

Foreign key

Secondary Key

Composite key

Primary key

11 / 20

______ is a special type of integrity constraint that relates two relations & maintains consistency across the relations.

Domain Integrity Constraints

Entity Integrity Constraints

Referential Integrity Constraints

Domain Constraints

12 / 20

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

Database

Table

Row

Column

13 / 20

What is TRUE about NOT NULL Constraint?

By applying the NOT NULL constraint, we will always ensure that the column contains a unique value and won't allow nulls.

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

The value will first be checked for certain conditions before inserting it into the column when a NOT NULL constraint applies to a column in the table.

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

14 / 20

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

Sequential

Referential

Relational

Consecutive

15 / 20

Which constraint can be define only at the column level?

Unique

Primary key

Not null

Check

16 / 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’)

17 / 20

________ is preferred method for enforcing data integrity.

Cursors

Constraints

Triggers

Stored Procedure

18 / 20

Select the correct constraint in SQL?

DEFAULT

CHECK

NOT NULL

All of the above

19 / 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

20 / 20

_______ and _______ constraints form the core of the PRIMARY KEY constraint.

NOT NULL , UNIQUE

NOT NULL , CHECK

NOT NULL , DEFAULT

NOT NULL , FOREIGN KEY

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!