Update Statement in SQL

I have a table in SQL. It has details of Product,Price,Sales Area , Date and Value. I want to run an update statement so that the value column is populated with Price for that day. Even though if the regions are different and price is same for that product on that day we should only populate value column once. But if the product is sold in different areas with different price then we need to show those different price for that product for that day

Please find the attached exampleData
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Mark WillsTopic AdvisorCommented:
update p set [value] = price
from yourtable p

using the alias will keep row alignment in check.
might like to add in a check for date or price variations.
or where clauses like 'Ball' and 'SA' to limit the "test"

take a copy before you start and test :

select * into tmp_yourtable_backup from yourtable   -- where tmp_yourtable_backup must not already exist - so make the "into" table name unique
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Ryan ChongCommented:
try something like this instead:

;with b as 
(
	select a.*, 
	case when row_number() over (partition by a.Product, a.Date, a.price order by a.id) = 1 then a.Price else 0.0 end s
		from tableSales a
)
update a set a.value = b.s
from tableSales a inner join b
on a.id = b.id

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