On Fri, 30 Dec 2016, David G. Johnston wrote:
"The CHECK clause specifies an expression producing a Boolean result which
new or updated rows must satisfy for an insert or update operation to
succeed. Expressions evaluating to TRUE or UNKNOWN succeed."
NULL == "UNKNOWN"
David,
I forgot about that. Thanks for pointing it out to me.
Regards,
Rich
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general