CREATE CLUSTER call_detail_cluster ( 
   telephone_number NUMBER, 
   call_timestamp   NUMBER SORT, 
   call_duration    NUMBER SORT ) 
  HASHKEYS 10000 
  HASH IS telephone_number 
  SIZE 256; 

CREATE TABLE call_detail ( 
   telephone_number     NUMBER, 
   call_timestamp       NUMBER   SORT, 
   call_duration        NUMBER   SORT, 
   other_info           VARCHAR2(30) ) 
  CLUSTER call_detail_cluster ( 
   telephone_number, call_timestamp, call_duration );

SELECT c.col#, c.name,
       CASE
         WHEN MOD(BITAND(c.property, 4294967295), 268435456) >= 134217728 THEN
           'SORT'
       END sort_clause
  FROM all_objects o,
       col$ c
 WHERE o.object_type = 'CLUSTER'
   AND o.owner = <owner>
   AND o.object_name = 'CALL_DETAIL_CLUSTER'
   AND c.obj# = o.object_id