Update data with subquery

Hi all,
I have two tables A(a1,a2,a3) and B(b1,b2,b3) then I want to update data
in column A.a3 to '4' where A.a1 = B.b1 and A.a2 = B.b2
How to write this update script?
Thank you,
Mcka

Hi Rodwest,
Thank you for your answer ,but can I use this script
update A
set A.a3 = 4
where (a1,a2) IN (select b1,b2
from B
where A.a1 = B.b1 and A.a2 = B.b2)
If can use, which one is better?
Thank you ,
Vilas

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