같은 DB인가요?
그런 말이 없는 것 보니 같은 db이겠죠

$sql = "select * from iconomy, member where iconomy.username = member.username";
$result = mysql_query($sql);
while( $row = mysql_fetch_assoc($result) )
 {
  foreach( $row as $key => $val )
  {
   if( $i < 1 )
   {
    $field_name[] = $key;
   }
   $field_value[] = $val;
  }
  if( $i < 1 ) $i++;
 }
 echo "<table border=1><tr>";
 for( $i=0 ; $i<count($field_name) ; $i++ )
 {
  echo "<th>$field_name[$i]</th>";
 }
 echo "</tr><tr>";
 for( $i=0 ; $i<count($field_value) ; $i++ )
 {
  if( $i > 0 && $i%count($field_name)==0 ) echo "</tr><tr>";
  echo "<td>$field_value[$i]</td>";
 }
 echo "</tr></table>";