2026-03-12 20:23:15

tpt/ast/03_bitmap_star_transformation.sql

@@ -0,0 +1,36 @@
+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+-- setting the 11.2 cardinality feedback option to false for demo stability purposes
+exec execute immediate 'alter session set "_optimizer_use_feedback"=false'; exception when others then null;
+
+SELECT  /*+ star_transformation */
+    ch.channel_desc
+  , co.country_iso_code co 
+  , cu.cust_city
+  , p.prod_category
+  , sum(s.quantity_sold)
+  , sum(s.amount_sold)
+FROM
+    sh.sales     s
+  , sh.customers cu
+  , sh.countries co
+  , sh.products  p
+  , sh.channels  ch
+WHERE
+    -- join
+    s.cust_id     = cu.cust_id
+AND cu.country_id = co.country_id
+AND s.prod_id     = p.prod_id
+AND s.channel_id  = ch.channel_id
+    -- filter
+AND ch.channel_class = 'Direct'  
+AND co.country_iso_code = 'US'  
+AND p.prod_category = 'Electronics'
+GROUP BY
+    ch.channel_desc
+  , co.country_iso_code
+  , cu.cust_city
+  , p.prod_category
+/
+