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  1. or download this
    my $sql = qq/
SELECT id
...
print "Try areaname is null in sql, got id is: @rows  \tRV was $rv\n";

$sth->finish;
  2. or download this
    Try BUFFALLO, got id is: 23     RV was: 0E0
No Rows!
 Try undef, got id is:          RV was: 0E0 
Try areaname is null in sql, got id is: 1       RV was 0E0