September 2013
Intermediate to advanced
114 pages
2h 51m
English
Content preview from Using OpenRefineBecome 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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Recipe 3 – detecting duplicates
In this recipe, you will learn what duplicates are, how to spot them, and why it matters.
The only type of customized facet that we left out in the previous recipe is the duplicates facet. Duplicates are annoying records that happen to appear twice (or more) in a dataset. Keeping identical records is a waste of space and can generate ambiguity, so we will want to remove these duplicates. This facet is an easy way to detect them, but it has a downside; it only works on text strings, at least straightforwardly (to learn how to tweak it to work on integers as well, have a look at Appendix, Regular Expressions and GREL).
Too bad then; we cannot use a duplicate facet on the Record ID column. The next best thing is to run ...
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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.