Missing an option to use SQL's HAVING clause in F3 - mysql

Question

Is there a way to use MySQL's HAVING clause with any of Fat Free Framework's SQL Mapper object's methods? Let's assume I have the following DB table:
+----+-------+--------+
| id | score | weight |
+----+-------+--------+
| 2 | 1 | 1 |
| 2 | 2 | 3 |
| 2 | 3 | 1 |
| 2 | 2 | 2 |
| 3 | 1 | 4 |
| 3 | 3 | 1 |
| 3 | 4 | 3 |
+----+-------+--------+
Now I would like to run a following query:
SELECT id, SUM(score*weight)/SUM(weight) AS weighted_score GROUP BY id HAVING weighted_score>2
Truth to be told I would actually like to count the number of these records, but a count method doesn't support $options.
I can run the query without a HAVING clause and then loop through them to check weighted_score against the value, but with a growing number of records will make it more and more resource consuming. Is there any built-in solution to solve this problem?
EDIT 1:
The way I know how to do it if there is no support for the HAVING clause (based on manual):
$databaseObject = new DB\SQL(...);
$dataMapper = new \DB\SQL\Mapper($databaseObject, "tableName");
$dataMapper->weightedScore = "SUM(weight*score)/SUM(weight)";
$usersInfo = $dataMapper->find([],["group"=>"id"]);
$place = 1;
foreach ( $usersInfo as $userInfo ) {
if ( $usersScores->weightedScore > 2) $place++;
}
If I were able to use HAVING clause then the foreach loop would not be needed and the number of items loaded by a query would be reduced:
$databaseObject = new DB\SQL(...);
$dataMapper = new \DB\SQL\Mapper($databaseObject, "tableName");
$dataMapper->weightedScore = "SUM(weight*score)/SUM(weight)";
$usersInfo = $dataMapper->find([],["group"=>"id", "having"=>"weighted_score<2"]); // rough idea
$place = count($usersInfo);
And if count method supported $options it would be even simpler and it would save memory used by the app as no records would be loaded:
$databaseObject = new DB\SQL(...);
$dataMapper = new \DB\SQL\Mapper($databaseObject, "tableName");
$dataMapper->weightedScore = "SUM(weight*score)/SUM(weight)";
$place = $dataMapper->count([],["group"=>"id", "having"=>"weighted_score<2"]); // rough idea

Answer 1

Use Sub Query.
select count (0) from (SELECT id, SUM(score*weight)/SUM(weight) AS weighted_score GROUP BY id) where weighted_score>2;
Hope it will help.

Answer 2

As far as I know, you can put the HAVING clause into the group option:
$usersInfo = $dataMapper->find([],["group"=>"id HAVING weighted_score<2"]);
Another way could be to create a VIEW in mysql and filter the records on a virtual fields in that view.