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The SUM() 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

The SUM() Function

SUM() - This function returns the sum of the values in a specific column. Let's take a look at the example:

Explanation: The SUM() function returns the sum of the population of all countries in Asia from the country table.

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Everything was clear?

Section 5. Chapter 8
toggle bottom row

The SUM() Function

SUM() - This function returns the sum of the values in a specific column. Let's take a look at the example:

Explanation: The SUM() function returns the sum of the population of all countries in Asia from the country table.

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Everything was clear?

Section 5. Chapter 8
toggle bottom row

The SUM() Function

SUM() - This function returns the sum of the values in a specific column. Let's take a look at the example:

Explanation: The SUM() function returns the sum of the population of all countries in Asia from the country table.

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Everything was clear?

SUM() - This function returns the sum of the values in a specific column. Let's take a look at the example:

Explanation: The SUM() function returns the sum of the population of all countries in Asia from the country table.

Task

Write an SQL query that returns the sum of the surfacearea of countries from 'Europe'.

Here's a short example of the country table:

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

Section 5. Chapter 8
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