> yes, except I think you meant: > (unknown or false or false) = unknown > > as can be demonstrated by: > > test=# \pset null 'null' > Null display is "null". > test=# select (null or true); > ?column? > ---------- > t > (1 row) > > test=# select (null or false); > ?column? > ---------- > null > (1 row) Thanks for the clearification. I was totally wrong on that point. :-) Regards, Richard Broersma Jr.