Level 2.1 SQL Taskbook
Given the table:
| id | name | salary | city | registration_date |
| 1 | Aaron | 4300.00 | New-York | 2023-02-10 |
| 2 | Marina | 2000.00 | Minsk | 2022-12-10 |
| 3 | Max | 1500.00 | Kyiv | 2020-05-30 |
| 4 | Catherine | 3000.00 | Berlin | 2023-10-02 |
| 5 | Andrew | 900.00 | Berlin | 2021-08-31 |
Solve the following tasks for it:
Задание 1
Display a list of unique cities where users live.
Задание 2
Find users with the maximum salary.
Задание 3
Display the names of users whose salary is above the average salary of all users.
Задание 4
Find the number of users registered in the current year.
Задание 5
Display a list of users whose names start with the letter 'A'.