The clause that applies the aggregate functions to get a single result tuple for each group is known to be

The clause that applies the aggregate functions to get a single result tuple for each group is known as the "GROUP BY" clause.

Here are the steps to use it:

1. Select the columns you want to aggregate. This could be any column(s) in your table that you want to group together.

2. After your SELECT statement, add a GROUP BY clause.

3. In the GROUP BY clause, specify the column(s) that you want to group by.

4. After the GROUP BY clause, you can use an aggregate function like COUNT, SUM, AVG, MAX, or MIN to perform a calculation on each group of rows.

5. The result of the query will be a single result tuple for each group, with the aggregate function applied to each group.

Here is an example:

SELECT column_name, COUNT(*)
FROM table_name
GROUP BY column_name;

In this example, the query will return the count of rows for each unique value in the column_name column.