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CREATE TABLE CombineDie1Die2
AS 
  SELECT 
...
      a.WL = b.WL
    AND
      a.BL = b.BL

use strict;
use warnings;
...
            ) or die "Failed to prepare - " . $dbh->errstr;
$select->execute or die "Failed to execute - " . $select->errstr;
print Dumper $select->{NAME}, $select->fetchrow_hashref();