I want to increment a number value 'count' in dynamoDB. The problem I've is that I'm not sure if the key (pk,sk) actually exists.

for a given <pk,sk>
 - if <pk,sk,count> exists increment it by 1
 - if it is not exists add <pk,sk, count = 0>

I can do it in two separate queries but can it done in the same request?

Thanks, Omer