|Subject:||Can I use an index to get the last n records?|
|Posted by:||Timasmith (timasmi…@hotmail.com)|
|Date:||Mon, 16 Jul 2007|
If I have a table with 100,000,000 rows
sales(sales_id, sales_person_id, sales_date_time, ...)
create index sales_date_index on sales (sales_person_id,
I want to execute something like this (which doesnt work at all)
select * from sales
where sales_person_id = :sales_person_param
and rownum < 10
order by sales_date_time desc
I want it to use my sales_date_index to read just 10 indexed records -
NOT read all records for the sales_person_id, sort in memory and then
return me the result set.
Anyway in general I can force traversal of the records using an index?