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SQL Aggregate Functions

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SQL Aggregate Functions

An aggregate function is a function that performs a calculation on a set of values, and returns a single value.

Aggregate functions are often used with the GROUP BY clause of the SELECT statement. The GROUP BY clause splits the result-set into groups of values and the aggregate function can be used to return a single value for each group.

The most commonly used SQL aggregate functions are:

  • MIN() - returns the smallest value within the selected column
  • MAX() - returns the largest value within the selected column
  • COUNT() - returns the number of rows in a set
  • SUM() - returns the total sum of a numerical column
  • AVG() - returns the average value of a numerical column

Aggregate functions ignore null values (except for COUNT(*)).

We will go through the aggregate functions above in the next chapters.


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