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

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

2 / 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

3 / 20

What is the correct way to comment a single line in SQL?

-- This is a comment

# This is a comment

// This is a comment

/* This is a comment */

4 / 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

5 / 20

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

True

False

6 / 20

In the TRUNCATE statement, the ____ clause is omitted, as with the DELETE statement.

FROM

WHERE

WHAT

FOR

7 / 20

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

MEAN()

AVG()

MEDIAN()

AVERAGE()

8 / 20

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

ADD

INSERT

ALTER

None of the above

9 / 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

10 / 20

What is the function of the SQL 'UNION' operator?

Sorts the result set

Combines results from two or more SELECT statements

Limits the result set

Finds the intersection of two SELECT statements

11 / 20

What type of join returns all records from the left table and matched records from the right table?

OUTER JOIN

INNER JOIN

RIGHT JOIN

LEFT JOIN

12 / 20

Multiple rows can be inserted using the Oracle ____ statement.

INSERT FEW

INSERT

INSERT ALL

INSERT MULTIPLe

13 / 20

Oracle database supports ____.

Deleting, Altering Tables

Inserting, Updating

Dropping, Creating and Selecting

All of the above

14 / 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;

15 / 20

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

WHERE

GET

HAVING

FILTER

16 / 20

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

VULEA

VAULE

VALVE

VALUE

17 / 20

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

Conditions

Tables

Expressions

None

18 / 20

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

19 / 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

20 / 20

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

Retrieve

Delete

Create

Update

Your score is

The average score is 0%

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!