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I need to run a query but do not must return account id duplicated.

I followed these articles:

https://developer.salesforce.com/forums/?id=906F00000008yzrIAA
https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_select_groupby.htm

and this is my query:

SELECT Id, AccountId FROM Asset GROUP BY AccountId

but this gives an error:

[MALFORMED_QUERY] Field must be grouped or aggregated: Id

what do I need to change in my query to she works?