Question : Using SQL MAX Function

My goal is to retrieve only the most recent eventdate record for each company (id_company). In this first example, I'm seeing multiple records for both companies 12937 and 12933.


select id_event, id_company, updatedescription, eventdate
from events e
where e.id_company in (12937, 12933 )
            and
            (
                  (e.UpdateDescription = 'Rating Affirmed')
                  OR (e.UpdateDescription = 'Rating Assigned')
                  OR (e.UpdateDescription = 'Rating Change - Downgrade')
                  OR (e.UpdateDescription = 'Rating Change - Upgrade')
            )
order by id_company;


In this example, I'm trying to pull only the most recent eventdate record for each company by using SELECT MAX(e2.EventDate). It mysteriously works for only one company (12937) by pulling only the max eventdate row but I get no records at all for 12933. Unfortunately, I'm using SQL 2000 so I can't use some of the newer SQL functions.  


select id_event, id_company, updatedescription, eventdate
from events e
where (  e.eventdate =
      (
            select MAX(e2.EventDate)
            from events e2
            where e2.id_company = e.id_company
            and
            (
                  (e.UpdateDescription = 'Rating Affirmed')
                  OR (e.UpdateDescription = 'Rating Assigned')
                  OR (e.UpdateDescription = 'Rating Change - Downgrade')
                  OR (e.UpdateDescription = 'Rating Change - Upgrade')
            )
      )
)
and e.id_company in (12937, 12933 )
order by id_company, eventdate desc;

Answer : Using SQL MAX Function

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