Title: Describe how to write a query containing group functions.
Course: Database Design and Management (Oracle) (10052) > Section: Aggregating Data Using GROUP Functions

Description should include the following guidelines for writing a query containing group functions:

- DISTINCT makes the function include unique values only.
- SELECT COUNT (DISTINCT StudentName)
- Results are implicitly ordered in ASC (ascending) when using a GROUP BY clause. DESC (descending) order can be enforced later in an ORDER BY clause.