December 1998
Intermediate to advanced
512 pages
13h 3m
English
Content preview from Informix DBA Survival Guide, Second EditionBecome 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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Find Duplicate Values in a Table
There are several reasons that you may want to find duplicate values in a table. The main reason is when you are attempting to build a unique index on a field and the index build crashes with a SQL duplicate value error. This error message does not go far enough in that it tells you it has a problem, but it does not tell you where the duplicate value occurs. All that you know is that you have a duplicate value somewhere.
There are several approaches to solving this problem, and one good method for avoiding it. If you initially build the table with a unique index on the field in question, you will avoid the duplicates in the first place. This requires planning ahead. You have to know in advance that you want field ...
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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.