Alpha Beta wrote:
Hi list, (newbie with databases)
I was looking out in net about how can we determine or find all
functional dependencies in a relational database, but didn't find.
So can please anyone here tell me if functional dependecies for each
table of a relational database can be found explicitly or
we need algorithms for it or any other way?
Best regards!
Look for pairs of columns/attributes X and Y (or X may be a set of
columns/attrs) where, for every row/tuple having the same value for X, the
row/tuple always has the same value for Y. In this situation, for the data you
have at least, there would seem to be a relationship where X determines Y and Y
depends on X. Use an algorithm that does this looking for pairs. -- Darren Duncan
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
