Derby 10.4 allows multiple nulls for unique columns.I'm using 10.4.1.3 but it doesn't seem to work - is there some sort of spacial chant I need to do to enable this?
Ah, you have to add it as a 'unique' table constraint, if you add a unique index it doesn't work. Odd, shouldn't you be able to do it either way?
-- Alan Burlison --
