Instruction
A-ma-zing! Part 2 was no problem for you! Take a look at our third task:
essay (id, person, topic, length, points)
We're now going to analyze essays written by various students. Each essay has an id, was written by a specific person, has a certain topic and a certain length (expressed as the number of words). Each essay is given points (0-100).
There may be more than one essay written by the same person.
Exercise
Show students' names (column person) together with
- the number of essays they handed in (name the column
number_of_essays). - their average number of points (name the column
avg_points).
Show only those students whose average number of points is more than 80.
Stuck? Here's a hint!
Use the following template to help you build your query:
SELECT ... FROM ... GROUP BY ... HAVING ...;
