Hi Martijn,

:-) I already make extensive use of domains with check constraints - the
primary table has every field except the primary key field as a domain with
a check constraint.

As I said, the problem isn't the Inserts so much as the deletes. In the
case of a tax table (we also have three here), how do I prevent the user
from deleting a tax type if there are any records in the primary table with
that tax type?

Regards

Tim


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