Setting a variable in a select statement

I have the following simple query:

declare @product varchar(50);
select top 1 productid, count(*) as total from orderlines  group by productid order by total desc

I need to get the productid from the query, store it in the variable @product and then use the variable in another query. How can i do that in MS SQL Server 2008?
troycompAsked:
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Patrick MatthewsCommented:
Something like this:

declare @product varchar(50);
set @product = (select top 1 productid
    from orderlines  
    group by productid 
    order by count(*) desc)

SELECT *
FROM product_orders
WHERE productid = @product

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troycompAuthor Commented:
Thank you!!!
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