查询ms访问中的增量值

Question

I am making a query that shows values grouped by month, their count and their value like this:

Month  count  value
1       7      480€
2       8      500€
3       3      250€

and I want it to contain an incremental value like this:

Month  count  value  incr.  incr. val
1       7      480€   7       480€
2       8      500€   15      980€
3       3      250€   18      1230€

I can't do this at all. I just can't or there is a way?

Answer 1

A funning value is a bit of a pain in MS Access, but you can calculate it using a correlated subquery:

select t.*,
       (select sum(t2.count)
        from t as t2
        where t2.month <= t.month
       ) as running_count,
       (select sum(t2.value)
        from t as t2
        where t2.month <= t.month
       ) as running_value
from t;

Answer 2

You can use subquery :

select t.*, (select sum(t1.count)
             from table t1
             where t1.Month <= t.Month  
            ) as incr,
            (select sum(t1.value)
             from table t1
             where t1.Month <= t.Month  
            ) as incrval,
from table t;