Kontsevich and colleagues' logic seems to be the following: posing the unique criterion constraint (their eq. 2) and given the equality of the zFAs (or, equivalently, of p(FA)-s; their eq. 3), the ...

I've got an interesting constraint I'm trying to add to our database. I can do with with triggers, but am curious if there is a more elegant way to do this in T-SQL (SQL2005, FWIW) We have two related ...

My table is as follows: I have a candidate key using columns A-E. This is too many, but column A is very helpful to keep in each table that references it, so I want to generate a surrogate key using ...