within() public method
Sets the WITHIN GROUP ORDER BY part of the query. See also addWithin().
public $this within ( $columns )$columns
string|array
The columns (and the directions) to find best row within a group. Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array (e.g. ['id' => Query::SORT_ASC, 'name' => Query::SORT_DESC]). The method will automatically quote the column names unless a column contains some parenthesis (which means the column conta