Partition-wise operations are not something new. I do not remember when they were introduced, but at that time the release number was still a single digit. Anyway, the aim of this post is not to describe the basics, but only to describe what is new in that area in 12c and 18c.
The new features can be grouped in three categories:
- Partition-wise GROUP BY enhancements available as of version 12.2
- Partition-wise DISTINCT enhancements available as of version 12.2
- Partition-wise windowing functions enhancements available as of version 18.1
Before looking at the new features, here are the SQL statements I executed to create a partitioned table that I use through the examples. You can download the script here.