RE: Syntax of case statement using a count function

>What I'm trying to do is use the count function in a
>case statement like I'm using the sum function below:
>
>Select fielda, fieldb,
> sum(case when "MONTH" = 1 then sales else 0 end)
> sum(case when "MONTH" = 2 then sales else 0 end)
> .
>From Filez
>Group by fielda, fieldb

When I try it, SQL insists that MONTH be in my group by clause:
select name,
  case when zip='55555' then count(*) end,
  case when zip='54321' then count(*) end
from master
group by name
Column ZIP or expression specified in SELECT list not valid.
(this works if I put ZIP in the group by)

Peter's suggestion works, but may not make logical sense because of the
group by:
select name,
  sum(case when zip='55555' then 1 end),
  sum(case when zip='54321' then 1 end)
from master
group by name

These yield identical results for me.

Buck