public function get_field_values($table, $field = null,  array $where = [], array $order = []){
    return $this->get_column_values($table, $field, $where, $order);
  }
public function get_field_values($table, $field = null,  array $where = [], array $order = []){
    return $this->get_column_values($table, $field, $where, $order);
  }
public function get_field_values ( $ table , $ field = null , array $ where = [ ] , array $ order = [ ] ) { return $ this -> get_column_values ( $ table , $ field , $ where , $ order ) ; }
Return the unique values of a column of a table as a numeric indexed array.

```php
\bbn\x::dump($db->get_field_values("table_users", "surname", [['id', '>', '2']], 1, 1));
// (array) ["Smiths", "White"]
```

@param string|array $table The table's name or a configuration array
@param string $field The field's name
@param array $where The "where" condition
@param array $order The "order" condition
@return array | false
Return the unique values of a column of a table as a numeric indexed array .