How to select the most recent set of dated records from a mysql table

Question

I am storing the response to various rpc calls in a mysql table with the following fields:

Table: rpc_responses

timestamp   (date)
method      (varchar)
id          


        

Answer 1

Self answered, but I'm not sure that it will be an efficient enough solution as the table grows:

SELECT timestamp,method,id,response FROM rpc_responses 
INNER JOIN
(SELECT max(timestamp),method,id FROM rpc_responses GROUP BY method,id) latest
USING (timestamp,method,id);