Why can't I use alias in a count(*) “column” and reference it in a having clause?

Question

I was wondering why can\'t I use alias in a count(*) and reference it in the having clause. For instance:

select Store_id as StoreId, count(*) as _count
             


        

Answer 1

Here is my contribution (based on the code posted here):

select * from (
  SELECT Store_id as StoreId, Count(*) as StoreCount 
  FROM StoreProduct
  group by Store_id
  ) data
where data.StoreCount > 0