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@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
