[PDF] aggregate functions in sql with examples

Aggregate functions in SQL
  • COUNT counts how many rows are in a particular column.
  • SUM adds together all the values in a particular column.
  • MIN and MAX return the lowest and highest values in a particular column, respectively.
  • AVG calculates the average of a group of selected values.
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  • What is an example of an aggregate function?

    For example, avg() (average) can be computed by sum()/count(), where both sum() and count() are distributive aggregate functions. Similarly, it can be shown that min_N() and max_N() (which find the N minimum and N maximum values, respectively, in a given set) and standard_deviation() are algebraic aggregate functions.
  • The first option is to combine two aggregate functions using a subquery. The subquery is a query within the main query. When creating reports, they are usually found in the SELECT , FROM , or WHERE clauses. In this example, I'll put the subquery in the FROM clause.
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