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

Sorting Data

We can sort the data we receive in a specific order. To do this, we first retrieve the data using the SELECT operator and then apply the ORDER BY clause. This clause takes the names of columns based on which the output will be sorted.

Here's the syntax to help us understand:

Here is the example where we ordering the result by continent column:


              123
            
SELECT continent 
FROM country 
ORDER BY continent;

It’s important to note that when you specify a column with integer values, the sorting will be done in ascending order. For string columns, the sorting will follow alphabetical order.

Also, the ORDER BY clause should be placed just before the LIMIT clause, if a LIMIT clause is included in the query.

Explanation: In the example, you can observe that the ORDER BY clause sorts the data based on the continent column.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the capital column from the country table. Then, sort the data from the capital column, retrieved using the SELECT statement.

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 2. Chapter 1

Sorting Data

Here's the syntax to help us understand:

Here is the example where we ordering the result by continent column:


              123
            
SELECT continent 
FROM country 
ORDER BY continent;

It’s important to note that when you specify a column with integer values, the sorting will be done in ascending order. For string columns, the sorting will follow alphabetical order.

Also, the ORDER BY clause should be placed just before the LIMIT clause, if a LIMIT clause is included in the query.

Explanation: In the example, you can observe that the ORDER BY clause sorts the data based on the continent column.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the capital column from the country table. Then, sort the data from the capital column, retrieved using the SELECT statement.

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 2. Chapter 1

Sorting Data

Here's the syntax to help us understand:

Here is the example where we ordering the result by continent column:


              123
            
SELECT continent 
FROM country 
ORDER BY continent;

It’s important to note that when you specify a column with integer values, the sorting will be done in ascending order. For string columns, the sorting will follow alphabetical order.

Also, the ORDER BY clause should be placed just before the LIMIT clause, if a LIMIT clause is included in the query.

Explanation: In the example, you can observe that the ORDER BY clause sorts the data based on the continent column.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the capital column from the country table. Then, sort the data from the capital column, retrieved using the SELECT statement.

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

Everything was clear?

Thanks for your feedback!

Here's the syntax to help us understand:

Here is the example where we ordering the result by continent column:


              123
            
SELECT continent 
FROM country 
ORDER BY continent;

It’s important to note that when you specify a column with integer values, the sorting will be done in ascending order. For string columns, the sorting will follow alphabetical order.

Also, the ORDER BY clause should be placed just before the LIMIT clause, if a LIMIT clause is included in the query.

Explanation: In the example, you can observe that the ORDER BY clause sorts the data based on the continent column.

Here is the country table we are working with:

Task

Swipe to show code editor

Write an SQL query to retrieve the capital column from the country table. Then, sort the data from the capital column, retrieved using the SELECT statement.

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

Section 2. Chapter 1

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