November 1998
Beginner
496 pages
14h 6m
English
Content preview from Sams Teach Yourself COBOL in 24 Hours
Hour 14
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Hour 14Indexed Files
An Indexed file is a file that allows access to data records by way of a Key field. The file is said to be “Indexed” by this Key. Indexed files are sometimes referred to as keyed files. In this hour, you learn the basics of Indexed file handling, such as
• Defining an Indexed file
• Handling Primary and Alternate Keys
• Writing records with an Indexed file
• Using File Status values
• Using Declaratives
A record in an Indexed file contains at least one Key field. This field is the index to the file. There must be at least one Key field that contains a value that is unique. This Key field is the Primary Key. Each record in the file is uniquely identified by this Key, which functions like a serial number. With this Key you ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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.