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 in SQL (Structured Query Language).

Here are the steps to use it:

1. Select the columns you want to aggregate. This could be any column(s) in your table.
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.
4. If you want to filter the results after grouping, you can use the HAVING clause. This is similar to the WHERE clause, but works after grouping has been applied.

Here is an example:

SELECT column_name, AGGREGATE_FUNCTION(column_name)
FROM table_name
WHERE condition
GROUP BY column_name
HAVING condition;

In this example, column_name is the name of the column you want to aggregate, AGGREGATE_FUNCTION is the aggregate function you want to use (like COUNT, SUM, AVG, etc.), table_name is the name of your table, and condition is the condition for the WHERE and HAVING clauses.