Hi All,
I am creating a database for employee records.
Each employee has their unique ID
When an employee has a change in thier employment, (EG receives a promotion or a salary increase), I would like to be able to keep a record of this update. For example the data would read:
Jo Bloggs New Joiner 1st Jan 2018 salary of 5USD
Jo Bloggs Promotion 1st Jan 2019 SAlary of 7USD
This would cause the unique ID to have multiple entries. If i remove it as primary key then how do I maintain the data accuracy with its relationship to the rest of the employee database. If i unlink it, then how does the database know to read the most current dated entry.
I am so stuck.
Help me please!