Getting a conditional counter into a SQL select statement

I have a select statement that produces these results:

item_no             seq_no            demand                group
123                    5                      P                          0
234                   10                     null                       0
345                   15                     null                       0
456                    20                    P                          0
567                    25                    null                       0

The query currently looks like this:
select             item_no,seq_no,demand,0
from                myTable
order by         seq_no

What I want the statement to do is that whenever it sees a record where demand = "P", increment the group number so that the result set looks like this:

item_no             seq_no            demand                group
123                    5                      P                          10
234                   10                     null                       10
345                   15                     null                       10
456                    20                    P                          20
567                    25                    null                       20

(group does not need to be in increments of 10; it just needs to be unique)

I eventually need to make this into a view.

Can this be done in a view?
LVL 4
g_johnsonAsked:
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Guy Hengel [angelIII / a3]Connect With a Mentor Billing EngineerCommented:
is seq_no the "sequential" field for the data, aka unique, and the "order by" of your query?if yes:
select t.*
   , (select count(*) from yourtable i where i.seq_no <= t.seq_no and i.demand = 'P' ) group
  from yourtable
order by seq_no

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g_johnsonAuthor Commented:
Thank you!
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