php - removing avoiding duplicates from resultset -

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i have query: 

$relevantwords = {"one" , "two" , "three" } ;  foreach ($relevantwords $word)      {         $query .=  "select * delhi_items heading '%$word%' , id!={$entry_row['id']} , visible=1 union "  ;       } $query = implode( " " , explode(" " , $query , -3) ) ;                                                        $query .= " order time_stamp desc limit 0, 20 " ;      $result_set = mysql_query($query, $connection);

this causes several duplicates in resultset. there way detect , remove these duplicates resultset ? know should try avoid duplicates in first place, unable figure out.

also tried distinct keyword, didn't work (because loop, same entry fetched again , again).

laslty kind of amateur please tell me if doing fundamentally uncool such long sql query in loop.

thanks

i try have 1 select , no union , distinct. faster query:

$relevantwords = {"one" , "two" , "three" } ;  $querycondition = "" ; foreach ($relevantwords $word)      {         $querycondition .= " heading '%$word%' or"      } $querycondition = substr($querycondition ,0 ,strlen($querycondition)-2 ) ;  $query = " select * "        . " delhi_items "        . " ( "        .           $querycondition         . "       ) "        . "   , id!={$entry_row['id']} "        . "   , visible=1 "        . " order time_stamp desc "        . " limit 0, 20 " ;  $result_set = mysql_query($query, $connection);

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