November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome 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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Cleaning up data in the database
Cleaning up data is an important topic; often, the data life cycle is not defined when creating a database application. This leads to tons of outdated data. Unclean data hinders several processes, such as database refactoring. Also, it can have a side effect on all processes in the company, such as wrong report results, billing issues, unauthorized access, and so on.
Getting ready
Several recipes were introduced to determine unused objects, but this is not all. The data itself should be cleaned, and the data life cycle should be defined.
For unclean data, there are several scenarios; however, let's focus here only on duplicated rows due to the missing unique and primary key constraints.
How to do it…
The first step ...
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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.