Don Knuth wrote a whole 300+ page book on random numbers ... that should serve as a definitive guide .... see Art Of Computer Programming (me thinks it is volume 3 or 4 not sure). Raj > On Tue, 4 Jan 2005 17:12:37 -0500, Mark W. Farnham <mwf@xxxxxxxx> wrote: > > You asked what is wrong with his select. > > > > Probably he is seeking information regarding the quality of the pseudo > > random sequence that is generated. > -- //www.freelists.org/webpage/oracle-l