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  1. or download this
    %DB = $db
        -> query('SELECT name, height, width, date FROM mydatabase')
        -> map_arrays( { byname => 0, bydate => 3 }->{$sort} );
    
  2. or download this
    %DB = $db
        -> query('SELECT name, height, width, date FROM mydatabase')
        -> map_arrays($sortby);