[wix-users] Order for feature Installation

[Ven H]

I have an MSI with 2 features, one for App and the other one for DB. I have
a little twisted requirement. During the initial installation, I need to
install DB feature first and then only App feature, whereas for Upgrade,
App feature should be installed first and then the DB feature. I know I can
run the installer twice and get it done, but I need to run it once and
achieve this. Please help.