Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære The AVG() Function | Aggregate Functions
Introduction to SQL
course content

Kursinnhold

Introduction to SQL

Introduction to SQL

1. Retrieving Data
Retrieving Individual ColumnsRetrieving Multiple Columns Retrieving All ColumnsRetrieving Distinct RowsLimiting ResultsChallenge: Find the Population of the CountriesChallenge: Find All CountriesChallenge: Find All Countries With Their IDsChallenge: Find Country CapitalsChallenge: Find the Regions in Which All Countries Are Located
2. Sorting Retrieved Data
Sorting DataChallenge: Population SortSorting by Multiple ColumnsChallenge: Dual-Sort QuerySpecifying Sort DirectionChallenge: Sort the Countries by Region and CapitalChallenge: Sort Capitals in Descending OrderChallenge: Sort Countries in Ascending OrderChallenge: Find Countries, Their IDs, and Their PopulationsChallenge: Find Countries, IDs, Populations, Regions, and Sort ThemChallenge: Find All Continents and Sort Them in Ascending Order
3. Filtering Data
Using the WHERE ClauseChallenge: North America Population SortThe WHERE Clause Operators Challenge: Population Threshold QueryChecking for a Range of ValuesChecking for NO Value
4. Advanced Data Filtering
Using the AND OperatorChallenge: Europe Region SortUsing the OR operatorChallenge: America Regions FilterUsing the NOT OperatorChallenge: Non-Europe Capitals Sort
5. Aggregate Functions
The AVG() FunctionChallenge: Surface Area SelectionThe COUNT() FunctionChallenge: Continental CountThe MAX() FunctionThe MIN() FunctionChallenge: Large Surface Area AverageThe SUM() Function

book
The 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 be used to find the average of a selected set of columns or rows that meet certain conditions. Here’s an example:


              
123

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

Here is the country table we are working with:

Oppgave

Swipe to start coding

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

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 5. Kapittel 1
toggle bottom row

book
The 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 be used to find the average of a selected set of columns or rows that meet certain conditions. Here’s an example:


              
123

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

Here is the country table we are working with:

Oppgave

Swipe to start coding

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

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 5. Kapittel 1
Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Vi beklager at noe gikk galt. Hva skjedde?
some-alt