Oracle constraint
You can achieve this using a funcction-based index (FBI):
create unique index idx on my_table (case when col != 'DEFAULT' then col end));
That creates a unique index on all values except 'DEFAULT'.
You can achieve this using a funcction-based index (FBI):
create unique index idx on my_table (case when col != 'DEFAULT' then col end));
That creates a unique index on all values except 'DEFAULT'.