I have the following rows (in addition to others):
acct_num text,
master_acct_num text,
These are in the same table.
What I want to enforce is that if the master_acct_num field is NOT NULL (it
can be NULL, and
that's fine), that the value appears in some row as acct_num. acct_num has
a unique index on it, so that's fine.
I'm not sure how to do this....
Thanks!
LER
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749