mysql - 私のクエリは毎回同じ（date2）を返します

Question

SELECT  o.Date1, o.Date2 
FROM customers AS c, products AS p, products_ids AS pi, orders AS o, temptable AS te 
WHERE p.productid = pi.productidD 
AND pi.prodno = te.prodno 
AND c.custid = o.custid
AND o.custid = te.custid 
AND te.custid =  '24' 
GROUP BY pi.productiD

mysql 内で日付が異なっていても、クエリの結果は毎回同じ日付 (1 行の) をすべての行に返します。