Update table field with sum of other table field

I am using SQL Server 2000.

I have a table called tblPartners and I want to run an sp every night that updates a field called TotalPaid.

The table that holds payment info is called tblPaymentInstalments and the field is called InstalmentAmnt.

The 2 tables are related via 2 other tables as follows:

tblPaymentInstalments inner join
tblPayments on tblPaymentInstalments.PaymentRef = tblPayments.PaymentRef inner join
tblProposals on tblPayments.ProposalNo = tblProposals.ProposalNo inner join
tblPartners on tblProposals.PartnerID = tblPartners.PartnerID

How do I write the sp that will update tblPartners.TotalPaid with the sum(tblPaymentInstalments.InstalmentAmnt) for each Partner?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

 from tblpartners as p
 inner Join (select pro.partnerID,sum(pi.InstallmentAmnt) as amt
                   from  tblPaymentInstalments as pi
                  inner join tblPayments as P
                     on PI.PaymentRef = P.PaymentRef
                  inner join tblProposals as Pro
                     on P.ProposalNo = Pro.ProposalNo
                   group by pro.partnerID
                   having sum(pi.InstallmentAmnt) <> 0
     on U.PartnerID = P.PartnerID


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
naqayyaAuthor Commented:
Thanks Lowfatspread, that worked beautifully!

(you forgot the 'as u' after subquery bracket, but no probs)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.