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relational design normalisation

P: n/a

I have a relational design question.
In the first requierement I got a table [contact] and a lookup
reference field that set the [statue] of the contact.
eg .

[Peter Liber] [Employee]
[Marc Stam] [CEO]
[Linda Tram] [Project Manager]

To every contact and his statue there are other data related eg. Time
Spend, Wage. Up to the moment that the Statue didn't change this works

The new requierement asked that the statue of a person could change in
the time and that this should have no influence on the past data. eg.
wage calculations. Lets say Peter statue is moving from Employee to
With the first design this should cause problems. Because past statue
data change to the new statue and the past wage calculations should
take the new wage and this produce incorrect past data.

How the I need to design my tables or relationsships to fit the new
requierement ?

Mar 17 '07 #1
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