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  1. or download this
    my ($row1,...) = $sth->selectrow_array;
    if( $row1 == undef ) {
    ...
    }
    # or
    $row1 = 0 if $row1 == undef;
    
  2. or download this
    if( not defined $row1 ) {
        $row1 = 0;
    }
    # or
    $row1 = 0 if not defined $row1;