August 2013
Intermediate to advanced
1472 pages
38h
English
Content preview from Oracle Database 12c The Complete ReferenceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER39Collectors (Nested Tables and Varying Arrays)
Collectors make use of object types. You should be familiar with the creation and implementation of object types (see Chapter 38) before attempting to use varying arrays and nested tables.
Varying Arrays
A varying array allows you to store repeating attributes of a record in a single row. For example, suppose you want to track which of your tools were borrowed by which of your neighbors. You could model this in a relational database by creating a BORROWER table:
Even though the borrower’s ...
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.