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  1. or download this
    sub GetNodes {
  my $meta = shift;
  my $sql = buildMetaQuery( scalar keys %$meta );
...
  $sth->execute( %$meta );
  $sth->fetchrow_array  
}
  2. or download this
    SELECT md1.node_id
 FROM `meta_data` as md1,`meta_data` as md2,`meta_data` as md3
 WHERE md1.name = ?
...
   AND md3.name = ?
   AND md3.value = ?
   AND md1.node_id = md2.node_id = md3.node_id;