On 02/06/2004 03:07:41 PM, Wolfgang Breitling wrote: > NULL is NULL. It is not equal anything and it is not unequal > anything. > It > is just NULL > Actually, I've noticed that many people have problems with ternary logic, where condition can be false, true and null. I'd put every relational database designer thru a course of the Zermelo-Frankel set theory. I know that relational databases are based on naive set theory (Cantor's theory) but Z-F with "axiom of choice" would teach them to excercise unusual way of thinking. It would very interesting to see the results and reactions..... ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------