Tutorial
Cheatsheet
Query
Chapter 1
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5
Chapter 2
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5
Chapter 3
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5
Exercise 1
Return how many gold medals
Usain Bolt
has, using the aggregate function
Count(*)
.
