Drupal dynamic queries have 2 conditional clauses called having and havingCondition.
The documentation states "The Having clause behaves identically to the WHERE clause, except that it uses methods havingCondition() and having() instead of condition() and where()."
Other than this I can't find any mention of either clauses anywhere (including in the examples module), or any examples of their use.
What is the difference between the 2 functions?