Id query VS Key query GAE

I'm asking a question during my development so if somone help it will be good: What the difference between using the key of an entitie to get it from the datastore or using the ID (in string format)? Is the key lower cost of operation in the datastore than ID?

Thanks for helping


The "getbykey" queries are indeed free, so it's better than looking up by ID cost-wise.

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