Hello Thomas,
Thanks for your mail. But you did exactly what I wanted to avoid, you
argued about a system for articles, prices and currencies. They are
just an example for the datastructure I have and which can not be
changed in my context. Just imagine that a certain product is not
always available and if it is not available there is no price. Thus,
in the example, I need the valid_to and I need to check if there is a
valid from, valid to period when I enter something in t_orders. One
could solve that differently, too. I know. But given a datastructure
like the one I described above, which I have seen in many places, how
does one organize that?
Best,
Hans
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