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

Checking for a Range of Values

To check for a range of values, we should use the BETWEEN operator. This operator requires two values: the start-value and the end-value of the range. Also, the AND keyword should be placed between these values.

Here is the syntax for using the BETWEEN operator:

Let's see an example:


              123
            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;

Here is the country table we are working with:

Task

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Write an SQL query that returns the name, capital, and population columns from the country table (please retrieve these columns in this order), for all countries with a population between 6000000 and 80000000. Then sort the result by capital from A to Z.

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Section 3. Chapter 5

Checking for a Range of Values

Here is the syntax for using the BETWEEN operator:

Let's see an example:


              123
            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;

Here is the country table we are working with:

Task

Swipe to show code editor

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 3. Chapter 5

Checking for a Range of Values

Here is the syntax for using the BETWEEN operator:

Let's see an example:


              123
            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;

Here is the country table we are working with:

Task

Swipe to show code editor

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 is the syntax for using the BETWEEN operator:

Let's see an example:


              123
            
SELECT name, population
FROM country
WHERE population BETWEEN 100000 AND 3000000;

Here is the country table we are working with:

Task

Swipe to show code editor

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

Section 3. Chapter 5

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