Not the monty hall problem please no! On 6 May 2011 19:12, "Rich Jesse" <rjoralist2@xxxxxxxxxxxxxxxxxxxxx> wrote: Michael writes: > Which of the two statements do you find is easier to understand? > > WHERE (txv.b... I'll take what's behind Door #3: WHERE txv.business_unit2tcode != 41940 OR txv.ext_source_key IS NULL; Simple, to the point, and logically equivalent to your first WHERE clause. Your second one gave me a headache. Just sayin'... Rich -- //www.freelists.org/webpage/oracle-l