January 2003
Intermediate to advanced
300 pages
15h 18m
English
Content preview from Data Quality
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12 b] c n A P X ~ rt 7 Data Profiling Overview
MAPS
derived from programming mate-
rials often do not map correctly to the
actual data. One study concluded that
approximately 80% of COBOL copy-
books incorrectly map to the data. Most
IT shops I mentioned this to did not dis-
pute this number.
Typical mismatches include cases
in which a column documented in the
copybook is subdivided into two or
more columns in practice, cases in
which field overloading is done and not
documented ('COBOL specifications do
not have constructs for overloading
except in the case of REDEFINES
that cover on~ one form of overload-
ing), and cases in wh&h programmers ...
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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.