Checking for every record in a table using PL/SQL

Hello Gurus,
I would need your help in finding the best approach to tackle the below analysis using PL/SQL.
I have a table which contains two columns
UserID and Month
I want to find out the users who made orders every month for the first half of 2012.That is the User ordered on Jan 2012, Feb2012 ... and June 2012.
The Table is huge and has more than a million records. How do I approach this in PL/SQL.
Joe

Hi Justin,
Thanks for the quick response. This is helpful.However my Intention is to do it using PL/SQL for learning purposes. I am new to PLSQL.
I wanted to do something like looping through each records in the table for every user ID and If I find orders for six consecutive months for a particular user, I will insert the user id to a temp table.
Any hints on how can I use this? I heard about cursor. Can I use it. If so how should I approach.
--Joe

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Checking for every record in a table using PL/SQL

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