On Tue, Jul 5, 2011 at 10:42 AM, M. D. <lists@turnkey.bz> wrote:
This is a little hard to explain, and I'm not sure if it's possible, but here goes.
This is my query: select year, month, (select number from account where account.account_id = view_account_change.account_id) as number, (select name from account where account.account_id = view_account_change.account_id) as account, sum(amount) as amount from view_account_change where view_account_change.change_date >= '2010-01-01' group by year,month, number, account order by year,month, number, account
I want to make an exception for the sum so that if the account number is less than 4000, I want a sum of all transactions until the last date of the group by.
the query for that would be: Select sum(amount) from view_account_change where change_date > "max date in the group"
I think you are looking for a window function, but I'm not sure about using a value computed over a window in the where clause. You may have to do something somewhat complicated with a subquery, but you can definitely compute 'max date in the group' via a window function:
You'll like have to split it into a UNION of 2 queries, one for account numbers lower than 4000 and the other for the rest.
Perhaps select max date in the group in a subquery which you then join to in an outer query. That should be enough to start experimenting with, anyway.
