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

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

Reversing

Adding

Restoring

Deleting

2 / 20

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

Retrieve

Delete

Create

Update

3 / 20

There is no effect on the _____ of the table with the TRUNCATE TABLE statement.

Triggers

Row

Queries

None of the above

4 / 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

5 / 20

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

Triple

Double

Single

Multiple

6 / 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

7 / 20

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

WHERE

GET

HAVING

FILTER

8 / 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

9 / 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

10 / 20

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

True

False

11 / 20

In a SQL query, what does the 'HAVING' clause do?

Sorts the result set

Filters records before aggregation

Limits the number of records

Filters records after aggregation

12 / 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 */

13 / 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;

14 / 20

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

FROM

WHERE

WHAT

FOR

15 / 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

16 / 20

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

Conditions

Tables

Expressions

None

17 / 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

18 / 20

Oracle database supports ____.

Deleting, Altering Tables

Inserting, Updating

Dropping, Creating and Selecting

All of the above

19 / 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;

20 / 20

The FROM clause must contain at least ____ table.

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!