You're about to write your first Oracle SQL queries! At the end of this chapter, you will be able to retrieve, order and filter data.

What is an Oracle database?

Writing your first query

Relational databases

Retrieving data

Removing duplicates

Working with strings

Arithmetic expressions

Ordering

Restricting data

Comparison operators

Logical operators

Comparison keywords

SQL Basics

Sometimes, you need to perform operations on a group of data, and get aggregated results. This second chapter will show you how. You will also learn about data types.

Group functions

Getting started with group functions

Counting

Options

Runs without error

Throws an error

Data types

Creating groups of data

Grouping

Advanced grouping

Restricting group results

Restricting groups

More restricting

Combining WHERE and HAVING

Aggregating Data

What if your data is spread across multiple tables? This third chapter will show you how to join several tables, and how to perform queries and operations on them.

Using joins

Inner joins

Using USING

Joining multiple tables

Outer joins

Picking an outer join type

Left outer join

Right outer join

More joins

Cross joins

Self joins

Set operators

I want it all

Under pressure

Another one bites the dust

Combining Data

By now, you already have some solid basics. Let's take it a step further and understand how Oracle SQL interprets your queries. You will then learn how to customize your outputs, handle missing values, and how to convert data from one type to another.

Query processing order

Order of execution of a query

Mistakes against query processing order

Customizing output

Rounding numbers

Working with the modulo

Manipulating strings

Replacing letters

Working with NULL values

Testing if a value is NULL

Replacing NULL values

Comparing values

Using conversion functions

Implicit and explicit conversion

Conversion functions

Congratulations!

Taking it to the Next Level

Chinook data

Oracle SQL is one of the most widely used database management system around the world. It's well suited to power primarily commercial and enterprise applications, and is particularly popular at large companies with mission-critical databases. Mastering Oracle SQL is therefore guaranteed to open exciting opportunities.
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In this course, you will get a complete introduction to Oracle SQL solving business problems for a digital media store. You will first learn how to access, retrieve and restrict data. You will then perform aggregation and combine tables. The last chapter will have you handle missing values and convert data. By the end of this course, you will understand how Oracle processes SQL queries and will have a solid foundation in Oracle SQL.

<h2>Gain an Introduction in Oracle SQL</h2> 
Oracle SQL is one of the most widely used database management systems around the world. It's well suited to power primarily commercial and enterprise applications, and is particularly popular at large companies with mission-critical databases.
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This introductory course will teach you all the essentials you need to master Oracle SQL. This includes SQL basics, aggregating, combining, and customizing data in Oracle. You will apply your newly acquired knowledge to solve business problems for a digital media store using the Chinook data.
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<h2>Practice Essential Skills Using Chinook data</h2> 
The course begins by exploring SQL Basics. In this chapter, you will familiarize yourself with topics such as what is an Oracle database and relational databases, and essentially how to retrieve, order, and filter data.
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The last chapter will explain how Oracle SQL interprets your queries. You will then learn how to customize your outputs, handle missing values, and how to convert data from one type to another.
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<h2>Further Develop Your Oracle SQL Skills</h2> 
By the end of this course, you will understand how Oracle processes SQL queries and will have a solid foundation in Oracle SQL. With the growing importance of relational databases, comes a simultaneously increasing demand of RDBMS and SQL programmers. Explore our library to discover more about SQL and its RDBMS.

Master the introductory skills for Oracle SQL in this four-hour course. You will learn SQL basics, aggregating, combining, and customizing data in Oracle SQL.

Introduction to Oracle SQL

Sharpen your skills in Oracle SQL including SQL basics, aggregating, combining, and customizing data. 

Column name	Example values
Milliseconds	343719, 205662, 342562
HireDate	2002-08-14, 2002-05-01, 2003-10-17
Total	1.98, 3.96, 5.94
FirstName	Helena, Astrid, Roberto
City	Copenhagen, New York, Brussels
UnitPrice	0.99, 1.99, 0.99
Country	Brazil, Austria, Germany
Composer	Jimmy Page, Frank Zappa, John Deacon

Data types

Introduction to Oracle SQL

Exercice interactif pratique