public function select($columns = '*')
    {
        settype($columns, 'array');

        $this->columns = array_unique(array_merge($this->columns, $columns));
        return $this;
    }
public function select($columns = '*')
    {
        settype($columns, 'array');

        $this->columns = array_unique(array_merge($this->columns, $columns));
        return $this;
    }
public function select ( $ columns = '*' ) { settype ( $ columns , 'array' ) ; $ this -> columns = array_unique ( array_merge ( $ this -> columns , $ columns ) ) ; return $ this ; }
Built a select query

@param   array|string    A string or an array of column names
@return  AnDatabaseQuery
Built a select query