I have a custom object "Quota", and am attempting to update a custom field "Rank" based on the ranking of quota records via the value in the field "Amount over Quota".  For example, the quota record with the largest value in "Amount over Quota" would need to have the "Rank" set at 1, and so on.  

I am struggling mightily with writing a trigger.  Anyone willing to lend a hand?  I have a total of 4 rankings that need to be updated in this way, but if I can get the first one done I'm sure I can figure out how to get the others done as well.

Thanks!

Even though my developer org has the Lightning App "My Data" its saying app is not available.

I’ve been tasked with automatically ranking our Accounts based on the qty listed in a "projected volume" field. Any suggestions?

Thanks in advance!

Ben