There is a table which tracks changes made to an account

Account
Number        Action    Date
-----------------------------------------------------------
1234            Open      11/01
1234            Upgrade  11/02
6666            Open      11/04
1234            Close      11/05
6666            Upgrade   11/05

Whats the query to get all accounts not closed(still open) on a given
month?
In this case for month 11 it should return 6666

this table can have millions of entry on a given month.


help!!!
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