In my SQL I have a table called members, a column called referral in member, says who referred who so:
NAME--REFERRAL
Jack--
Bob---Jack
Joe---Bob
Henry-Joe
Gabe--Jack
Pete--Gabe
Tim---Gabe

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I need to display a list on three levels so, say I gave you jack, and I wanted his referrals. 
Jacks Referrals:
Level 1:
 -Bob
 -Gabe
Level 2:
 -Joe
 -Pete
 -Tim
Level 3:
 -Henry

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

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And just go from there. This is how I want to have it though, have it like this. 
@ref = "Bob|Gabe",
"Joe|Pete|Tim",
"Henry";

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I can't find a way to do this

In reply to Building a List by Anonymous Monk

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