I have this perl mysql statement below that finds the next available number 
that's not in two table, and it works find.  But  what if I wanted to find the 
next available number starting at 100 or 1000, how would I introduce that in 
this code?

  my $sth = $dbh->prepare( "SELECT MIN(allnum) FROM (ReferenceNum LEFT JOIN 
UidNumber ON allnum = uid) left join GidNumber on allnum = gid WHERE uid is 
NULL and gid IS NULL" );





 
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