Hi All
we have a table like so:
customer (
cust_id integer not null primary key,
cust_group_id integer not null,
group_account_id integer not null,
cust_name varchar not null,
...
)
we want to force the cust_group_id to be unique across all
group_account_id's but not necessarily across the entire table
I assume the best approach would be a check constraint yes? Will this be
excessively poor per performance if the table gets big?
Thoughts?
Thanks in advance