Final answer:
Deleting a resource group in cloud services will remove all services contained within, including databases and virtual machines. It's vital to check resources within the group and back them up before deletion to avoid unintended data loss.
Step-by-step explanation:
True, if you delete a resource group in cloud computing platforms, such as Azure or AWS, all the resources contained within that group will indeed be deleted. This includes virtual machines, databases, and any other services that were part of the resource group. It is important to carefully confirm what resources are part of the group before deleting it to prevent unintended loss of services. Always ensure you have backups or have migrated necessary resources before initiating a resource group deletion.