Today meet a problem, do the background database design table there are four primary key, the background need to add and delete on the table, but at the time of change may modify the inside of the primary key, so don't know how to modify!!!!!!

1. This is the database table design (judge according to the four primary key data uniqueness) :


2. This is the database data


3. The background shows is that



I want to modify data, for example, may need to modify the primary key in a value, for example, modify the value that I should be how to modify, click save when value is passed to re-enter after the new value, matching data, can't modify,
This modification function to do???????