Question : Sql query

I have 2 tables.

tblContacts
    ID
    Name
    LastMessageDate

tblMessages
    ID
    Message
    ContactRef
    RecvdDate

Each contact may have many messages.  I just added the LastMessageDate field to the Contact table.  I want to update it with the most recently recieved message for each contact, as recorded in the tblMessage table.

How can I write a query to do this?

Answer : Sql query

update tblContacts
set LastMessageDate = M.Lmd
from tblContacts C
inner join (select Id, max(LastMessageDate) as LMD from tblMessages group by Id) M
on c.Id = M.Id