update with where and another select - doubt

Hello Guys

I have a table with prod_code and supplier_code.

I want to update my main table only when my prod_code and supplier_code is found in my table B

I am having doubt to assemble this

update siaprod set pro_pven where exists (select * from table B)

my siaprod has two field that has in table B

how can I do this?

Thanks
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hidrauAsked:
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wdosanjosCommented:
Please try:
update siaprod
 set pro_pven = << value to update >>
from siaprod s
inner join tableB b on s.prod_code = b.prod_code and s.supplier_code = b.supplier_code

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hidrauAuthor Commented:
thanks very much
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Microsoft SQL Server 2005

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