On Nov 19, 2008, at 9:12 AM, Josh Berkus wrote:
Folks,
Since it's too late to look at this for 8.4, can the following go on
the TODO list?
Referential Integrity
[] Allow creation of FKs targeting unique expression indexes on the
referenced table. Syntax: REFERENCES <reftable> ( ( column
expression ) )
Reason: current FK rules do not allow creating FKs to columns which
are defined as, for example, unique(lower(column)). This forces
users to either abandon RI for that table, to store duplicate data,
or create superfluous indexes.
Hmmm ... I suppose the above would require enabling expression
indexes for PKs as well, no?
In 8.4 you should be able to get around this particular example using
citext.
Best,
David
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
