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
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Соглашаюсь с условиями обработки персональных данных