Outer Join Problem . . .

Having a problem with an outer join. Trying to get a count grouped by month from a date field on a table. Want to display 0 for months not included in the table. Created a temp table that holds each month to outer join too. But oracle does not seem to like outer joining when I am useing a function on the table I will be weak on. I can subquery this out and it works. Just want to know if anyone knows why or has a better solution.

select m.name,

      nvl(count(t.field), 0)
  from tmp_months m,

      table t
where m.tag = to_char(t.date, 'MM') (+)
group by to_char(t.date, 'MM')

This gets me a not properly ended message. Take out the outer join and all is well. Hmm . . .

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