Oracle SQL Queries And Subqueries: Beginner-Level Quiz

Oracle Queries and Subqueries

Welcome to the "Oracle SQL Queries" quiz! This quiz is designed to test your knowledge of essential SQL concepts and commands used in Oracle Database. You'll encounter a variety of questions covering data retrieval, manipulation, and management techniques. From basic queries to more advanced operations, this quiz will challenge your understanding and help you strengthen your skills in SQL. Get ready to dive in and see how well you know Oracle SQL!

1 / 20

Which SQL function is used to calculate the average value of a numeric column?

MEAN()

AVG()

MEDIAN()

AVERAGE()

2 / 20

What does the SQL keyword 'ORDER BY' do?

Limits the number of records

Filters the result set

Sorts the result set

Limits the number of records

3 / 20

Which of the following are the types of sub-queries

Single row sub-queries

Ordered sub-queries

Grouped sub-queries

None of the above

4 / 20

Oracle has a DELETE statement that is used to delete a record from a table or multiple records from a table. True or False?

True

False

5 / 20

What will be the result of the following query: SELECT COUNT(DISTINCT department_id) FROM employees;?

Total number of unique department IDs

Total number of all departments including duplicates

Total number of employees

Total number of departments

6 / 20

Which of the following is a method for writing a sub-query in a main query?

By using the GROUP BY clause

By writing a SELECT statement embedded in the clause of another SELECT statement

By using JOINS

By using WHERE clause

7 / 20

The rows can be inserted into one table or multiple tables through only ____ SQL statement.

8 / 20

The FROM clause must contain at least ____ table.

9 / 20

Which clause is used to filter records in a SQL query?

WHERE

GET

HAVING

FILTER

10 / 20

You specify the tables from which you want records to be retrieved by the ____ parameter.

Conditions

Tables

Expressions

None

11 / 20

The TRUNCATE method is usually used when _____ is not necessary.

Reversing

Adding

Restoring

Deleting

12 / 20

Which command is used to remove a table from the database?

DROP TABLE table_name;

REMOVE TABLE table_name;

CLEAR TABLE table_name;

DELETE TABLE table_name;

13 / 20

To ___ records from a database, Oracle select queries are used.

Retrieve

Delete

Create

Update

14 / 20

By putting the ____ keyword in a database, you can insert an element into a database in the simplest way.

VULEA

VAULE

VALVE

VALUE

15 / 20

Oracle database supports ____.

Deleting, Altering Tables

Inserting, Updating

Dropping, Creating and Selecting

All of the above

16 / 20

A record is inserted into a table using an Oracle ____ query.

ADD

INSERT

ALTER

None of the above

17 / 20

Which of the following SQL statements will return the first 5 rows from a query?

SELECT * FROM table_name FETCH FIRST 5 ROWS ONLY;

SELECT * FROM table_name FIRST 5;

SELECT * FROM table_name TOP 5;

SELECT * FROM table_name LIMIT 5;

18 / 20

By using the INSERT ALL statement, multiple rows can be inserted into more than one table by a ____ command.

Triple

Double

Single

Multiple

19 / 20

Multiple rows can be inserted using the Oracle ____ statement.

INSERT FEW

INSERT

INSERT ALL

INSERT MULTIPLe

20 / 20

To retrieve records from a database, Oracle select queries are used. True or False?

True

False

Your score is

The average score is 75%

Oracle SQL Queries and Subqueries focuses on writing and optimizing SQL queries to retrieve and manipulate data from Oracle databases.

It also covers basic SQL operations like SELECT, INSERT, UPDATE, and DELETE and other advanced techniques like using subqueries to solve complex data retrieval tasks.

This quiz is ideal for individuals looking to enhance their skills in writing and optimizing SQL queries and performing complex data retrieval tasks.

All the best!