SQL Server store multiple values in sql variable

Question

I have the following query:

select * 
from cars 
where make in (\'BMW\', \'Toyota\', \'Nissan\')

What I want to do is store the where param

Answer 1

Fetch 1 value in table and store in variable    
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Declare @query int

    select @query = p.ProductID From Product p inner join ReOrdering as r on 
    p.ProductID = r.ProductID and r.MinQty >= p.Qty_Available

    print @query