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# Method Z
my @key_columns = $dbh->primary_key( $catalog, $schema, $table);

# my $limit = 6;
my $select = $dbh->prepare("select * from $table");# LIMIT $limit");
$select->execute();

while (my $row = $select->fetchrow_hashref()) {
    my $key = join '', delete @{$row}{@key_columns};
    $kol{$key} = $row;
}