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The AVG() Function | Aggregate Functions
Introduction to SQL
course content

Course Content

Introduction to SQL

Introduction to SQL

1. Retrieving Data
2. Sorting Retrieved Data
3. Filtering Data
4. Advanced Data Filtering
5. Aggregate Functions

bookThe AVG() Function

AVG() returns the average value of a certain column. Let's see an example:

12
SELECT AVG(population) FROM country;
copy

AVG() can also determine the average of specific columns or rows (with some conditions). Let's take a look at the following example:

123
SELECT AVG(population) FROM country WHERE population < 4478500;
copy

Task

Write an SQL query to retrieve the average value of a surfacearea column from the country table.

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

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Section 5. Chapter 1
toggle bottom row

bookThe AVG() Function

AVG() returns the average value of a certain column. Let's see an example:

12
SELECT AVG(population) FROM country;
copy

AVG() can also determine the average of specific columns or rows (with some conditions). Let's take a look at the following example:

123
SELECT AVG(population) FROM country WHERE population < 4478500;
copy

Task

Write an SQL query to retrieve the average value of a surfacearea column from the country table.

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 5. Chapter 1
toggle bottom row

bookThe AVG() Function

AVG() returns the average value of a certain column. Let's see an example:

12
SELECT AVG(population) FROM country;
copy

AVG() can also determine the average of specific columns or rows (with some conditions). Let's take a look at the following example:

123
SELECT AVG(population) FROM country WHERE population < 4478500;
copy

Task

Write an SQL query to retrieve the average value of a surfacearea column from the country table.

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

AVG() returns the average value of a certain column. Let's see an example:

12
SELECT AVG(population) FROM country;
copy

AVG() can also determine the average of specific columns or rows (with some conditions). Let's take a look at the following example:

123
SELECT AVG(population) FROM country WHERE population < 4478500;
copy

Task

Write an SQL query to retrieve the average value of a surfacearea column from the country table.

Here's a short example of the country table:

idnamecontinentregionsurfaceareacapitalpopulation
1JapanAsiaEastern Asia377829Tokyo126714000
2LatviaEuropeNULL64589Riga2424200
3MexicoNorth AmericaCentral America1958201Mexico City98881000
.....................
15MaltaEuropeSouthern Europe316Valletta380200

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 5. Chapter 1
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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