French language Q&A Forum

Bonjour Madame Cécile!

This is a sentence from a lesson explaining the use of “le meilleur” ->

C'est la meilleure idée que tu aies jamais eue!
It's the best idea you've ever had!

Here, why has the verb ‘avoir’ been placed in Le Subjonctif ? 

Is this because of the key word -> que ?

I request you to provide a few more examples as it’s the first time I have come across this case.

Merci beaucoup!

Je vous souhaite une bonne journée!