Course Content

Introduction to SQL

1. Retrieving Data

Retrieving Individual Columns Retrieving Multiple Columns Retrieving All Columns Retrieving Distinct Rows Limiting Results Challenge: Find the Population of the Countries Challenge: Find All Countries Challenge: Find All Countries With Their IDs Challenge: Find Country Capitals Challenge: Find the Regions in Which All Countries Are Located

2. Sorting Retrieved Data

Sorting Data Challenge: Population Sort Sorting by Multiple Columns Challenge: Dual-Sort Query Specifying Sort Direction Challenge: Sort the Countries by Region and Capital Challenge: Sort Capitals in Descending Order Challenge: Sort Countries in Ascending Order Challenge: Find Countries, Their IDs, and Their Populations Challenge: Find Countries, IDs, Populations, Regions, and Sort Them Challenge: Find All Continents and Sort Them in Ascending Order

3. Filtering Data

Using the WHERE Clause Challenge: North America Population Sort The WHERE Clause Operators Challenge: Population Threshold Query Checking for a Range of Values Checking for NO Value

4. Advanced Data Filtering

Using the AND Operator Challenge: Europe Region Sort Using the OR operator Challenge: America Regions Filter Using the NOT Operator Challenge: Non-Europe Capitals Sort

5. Aggregate Functions

The AVG() Function Challenge: Surface Area Selection The COUNT() Function Challenge: Continental Count The MAX() Function The MIN() Function Challenge: Large Surface Area Average The SUM() Function

Using the OR operator

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

Let's look at the example:


              123
            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

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Section 4. Chapter 3

Using the OR operator

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

Let's look at the example:


              123
            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 3

Using the OR operator

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

Let's look at the example:


              123
            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

The OR operator is used to filter records based on more than one condition, like if you want to return all countries from Asia but also those from Europe.

Here is the syntax of using the OR operator:

Let's look at the example:


              123
            
SELECT name, population, continent, region
FROM country
WHERE continent = 'Asia' OR continent = 'Europe';

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the name of the countries that are from 'Asia' or 'North America' continent.

Note

Note that north america is not the same as North America, and asia is not the same as Asia. Be careful and write correctly: North America and Asia.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 4. Chapter 3

Switch to desktop for real-world practiceContinue from where you are using one of the options below