public function get_column( $column, $row_key ) {
		return $this->get_column_by( $column, $this->table->get_primary_key(), $row_key );
	}
public function get_column( $column, $row_key ) {
		return $this->get_column_by( $column, $this->table->get_primary_key(), $row_key );
	}
public function get_column ( $ column , $ row_key ) { return $ this -> get_column_by ( $ column , $ this -> table -> get_primary_key ( ) , $ row_key ) ; }
Retrieve a specific column's value by the primary key

@since 1.0

@param string $column
@param string $row_key

@return string

@throws Exception
Retrieve a specific column s value by the primary key