MySQL data - Serve brain fart day

[visibleman]

MySQL data - Severe brain fart day

Hi All,
I have a simple staff booking table where everytime a staff member is 'out' it gets logged (B_ID is the primary key and auto incremented, and staff can have multiple entries for the same date), like so -

B_ID |    B_Date  | Staff_ID
-----|------------|----------
   1    2012-02-20      10
   2    2012-02-20      11
   3    2012-03-20      11

I basically need to return a list of any Staff member that haven't been 'out' for the last 6 months but i'm having a seriously bad case of brain farts today.

So far i can return the last booking of a specific staff -

SELECT b2.`Staff_ID` , b2.`B_Date` 
FROM  `bookings` b2
WHERE b2.`Staff_ID` = 11
ORDER BY b2.`B_Date` DESC 
LIMIT 1

But I'm being completely dense it grabbing a list of all Staff IDs that have a last known booking date (B_DATE) older than 6 months.

Edit - Think i've sorted it by using the HAVING clause.