SQL Taskbook Level 3.2
Given a 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 | Andrew | 1500.00 | Gdansk | 2023-08-31 |
| 5 | Andrew | 900.00 | Berlin | 2023-08-31 |
Solve the following tasks for it:
List users who have the same registration date (day and month) and indicate the number of such users.
Find users whose names appear more than once in the table and report the number of unique names.
Display the names of users whose name length exceeds the average length.
Find users who registered earlier than all users and provide their names and registration date.
