NAME--REFERRAL
Jack--
Bob---Jack
Joe---Bob
Henry-Joe
Gabe--Jack
Pete--Gabe
Tim---Gabe

##</code><code>##

Jacks Referrals:
Level 1:
 -Bob
 -Gabe
Level 2:
 -Joe
 -Pete
 -Tim
Level 3:
 -Henry

##</code><code>##

$sth = $dbh->do("SELECT referral FROM members WHERE username='Jack'");

##</code><code>##

@ref = "Bob|Gabe",
"Joe|Pete|Tim",
"Henry";