SQL Subtract exactly a year

Question

First I want to thank everyone for helping me, It gave me a lot of ideas on how I should do this and I came up with my own method I just need help putting it into a query

Answer 1

To subtract a year from a date simply use DATEADD() function

SELECT DATEADD(year, -1, GETDATE())

Edited:

SELECT SDESCR,DYYYY, Sum(APRICE) as Total, Sum(PARTY) as PAX
FROM  DataWarehouse.dbo.B01Bookings AS B101Bookings
WHERE 
(BOOKED <= Convert(int, Convert(datetime, Convert(varchar, DatePart(month, GETDATE())) + '/' + Convert(varchar, DatePart(day, GetDate())) + '/' + DYYYY))
Group By SDESCR,DYYYY
Order by DYYYY

Edited 2:

I just ran this statement

select  Convert(datetime, Convert(varchar, DatePart(month, GETDATE())) + '/' + Convert(varchar, DatePart(day, GetDate())) + '/' + '2007')

Which runs fine. so my question is what is stored in the DYYYY Column? Does it always contain a valid year, can it contain Nulls?