Accessing Data Warehouse with HTML DB

Question

I have a test data warehouse database 10g comprising of seven dimension tables and one fact table. When I access one table at a time, the query runs fine, but when I join two dimension tables or more to the fact table, the result set comes out wrong. The performance is also very poor. Is HTML DB not capable of properly accessing a data warehouse data?
Here is the query I'm having problem with:
SELECT p.prod_name, s.store_name, pr.week, sl.dollars
FROM sales sl, product p, period pr, store s
WHERE p.prodkey = sl.prodkey
AND pr.perkey = sl.perkey
AND p.prod_name LIKE 'Assam Gold%'
OR p.prod_name LIKE 'Earl%'
AND s.store_name LIKE 'Instant%'
AND pr.month = 'NOV'
AND pr.year = 2003
ORDER BY p.prod_name, sl.dollars DESC
Your input would be appreciated.

Answer 1

I doubt this was intentional, but you are not joining the store table to anything. You do filter the rows from that table with the AND s.store_name LIKE 'Instant%' predicate, but it is not joined to any of the other 3 tables. Your query will essentially return the number of rows from the other 3 tables multiplied by the number of rows returned from store. SYou might think about grouping some of your predicates for readability and possibly for correct logic.SELECT p.prod_name, s.store_name, pr.week, sl.dollars
  FROM sales sl, product p, period pr, store s
WHERE p.prodkey = sl.prodkey
   AND pr.perkey = sl.perkey
   -- Add missing predicate here
   -- AND s.something = sl,p, or pr .something
   -- end missing predicate
   AND (p.prod_name LIKE 'Assam Gold%'
        OR
        p.prod_name LIKE 'Earl%')
   AND s.store_name LIKE 'Instant%'
   AND pr.month = 'NOV'
   AND pr.year = 2003
ORDER BY p.prod_name, sl.dollars DESCHope this helps,
Tyler