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use Data:: Dumper;
...
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print Dumper $rows; <i>### This displays $VAR1 = []; which means the a
+rray reference is empty-but why?</i>
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my $rows=[];
    $sth = $dbh->prepare( $SQL );
...
    print Dumper $dbh; #Prints $VAR1 = bless( {}, 'DBI::db' ); 
    print Dumper $sth;#Prints $VAR1 = bless( {}, 'DBI::st' ); 
    print Dumper $rows; #Prints $VAR1 = [];