SQL Server查詢錯誤WHERE條件 GROUP BY列名（S） ORDER BY列名（S）;

Question

select Products.prodname, 
     sum(billdetail.Qty) as qty, 
     BillDetail.rate, 
     sum(billdetail.amt) as Amt 
from billdetail 
inner join products on products.prodid = billdetail.prodid 
inner join category on category.catid = products.catid 
group by prodname, rate 
where CatName = "Chicken"; 

Answer 1

-- Group by Come After Where Clause  
select Products.prodname, sum(billdetail.Qty) as qty,BillDetail.rate, 
     sum(billdetail.amt) as Amt from billdetail 
     inner join products 
     on products.prodid = billdetail.prodid 
     inner join category 
     on category.catid = products.catid 
     where CatName = 'Chicken' 
     group by prodname,rate