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Exercise

Aggregate functions

Often, you will want to perform some calculation on the data in a database. SQL provides a few functions, called aggregate functions, to help you out with this.

For example,

SELECT AVG(budget)
FROM films;

gives you the average value from the budget column of the films table. Similarly, the MAX() function returns the highest budget:

SELECT MAX(budget)
FROM films;

The SUM() function returns the result of adding up the numeric values in a column:

SELECT SUM(budget)
FROM films;

You can probably guess what the MIN() function does! Now it's your turn to try out some SQL functions.

Instructions 1/4

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  • 1

    Use the SUM() function to get the total duration of all films.

  • 2

    Get the average duration of all films.

  • 3

    Get the duration of the shortest film.

  • 4

    Get the duration of the longest film.