Claudio,
I am not sure why You need to use the Key for this, I would think that you leave your program open for an "endless" loop, for example your Key lenght allows 100.000.000 different records while you "only" have less than 2.000.000 records in the table, thus leaving a probability of 1/50 of getting a valid key.
If you think that the select statement can be slow, why don't you just generate a random record number?
Rand(-1)
lnRecno = Int(Rand() * Reccount('Table')) + 1
go lnRecno in Table
lcKey = Table.key
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges
