A lesson in using AJAX with MYSL in PHP

Hello everyone, you need training to use AJAX
access to MYSL in PHP files.

Whats interesting

1. Work in the table in 3 levels:

The user selects from the data from dropbox
Level 1 -
checkbox (data from MYS-L Depending on what the user chooses)
The user chooses what he needs

Level 2
additional checkbox (data from MYS-L Depending on what the user chooses)

Level 3
If you dont choose anything and/or want to add it, input text pops out


Important: All data received is stored in different variables
and transferred to the table with customer ID.

2.