April 2019
Beginner to intermediate
244 pages
6h 34m
English
Content preview from Programming Ecto
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Wrapping Up
Upserts are a great option when you have a data loading process, like inserting the contents of CSV file, that you want to be safely repeatable. However, your data source must have at least one column with a unique index. Our genres table is ideal, as we have a unique index on the name column. But if your only unique column is the primary key, upserts may not be the right option—it would be unusual for the key to appear in a CSV file.
For more information on using upserts, see the docs for insert_all[27] and insert.[28]
Footnotes
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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.