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Introduction to SQL

The AVG() FunctionThe AVG() Function

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

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

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

Everything was clear?

Section 5. Chapter 1
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