Getting a percentage from MySql with a group by condition, and precision

Question

I was about to ask the MySql list this and remembered about SO.

Running MySql 5.0.85, I need to be as efficient as possible about a few queries. If I could get a li

Answer 1

First Issue:

select count(*) from agents into @AgentCount;

SELECT user_agent_parsed
     , user_agent_original
     , COUNT( user_agent_parsed )  AS thecount
     , COUNT( * ) / ( @AgentCount) AS percentage
 FROM agents
GROUP BY user_agent_parsed
ORDER BY thecount DESC LIMIT 50;