How to create a sequence based on name, country, city, year, month, number

I am using Application Express
I am new to apex and i need some help in creating a sequence.
I am creating an application where i profile people and i need to create an auto sequence that when the person is added to the database he will have his own sequence based on his name, country, city, year he was added, month he was added and his number.
This is a bit tricky because each person will have a different name, country city etc.
How can this be done ?

I have to create a sequence so that when for example an employee is added using a form his ID will be saved based on his name, country, city, year he was created, month he was created and his number.
However, each employee is diff, so when you add another employee to the form his ID will be different, different name, country, city etc..
This has to be automatically generated.. is this possible?

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