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Do max and sum together in one query..

I have a column in oracle that I am using to create a query and this column has value
sum(user_count + data_count)/300 when application reads this query it will use to create the following query

select sum(user_count + data_count) as count_per_sec,datetime from tableA group by datetime
where datetime >='2009-01-00.00.00' and datetime < '2009-02-01-00.00.00'
Now I need to get the max value from the datetime period and I dont want to change the query that reads the custom column from oracle what value then should I need to change the column that will reflect the max value ?
I tried to change the column as max(sum(user_count + data_count)/300 ) as max_value but I got the error when I ran the query in db2
SQL0112N The operand of the column function "MAX" includes a column function,
a scalar fullselect, or a subquery. SQLSTATE=42607

Let me know how to resolve this?

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Guy Hengel [angelIII / a3]

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mahjag

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custom column in oracle can take only column_names and db2 query that is written from this custom column in oracle already does sum (custom_column from oracle), I dont think I can write a full query and db2 can consume and change that data..

I need to structure this as

select max(a.conn) from
( select sum(user_count + data_count) as conn from.....

I cannot do all this in custom column where it can take only the column that needs to be summed up.. let me know any altaernatives..