November 2012
Beginner
320 pages
6h 42m
English
Content preview from Getting Started with Talend Open Studio for Data IntegrationBecome 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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Extracts from multiple tables
The previous extract example was based on data from a single table, but we frequently need to retrieve data from multiple tables in a denormalized form. Most modern applications that use a relational database will have a normalized structure, so, by definition, extracting data in a denormalized form will involve joining data from different tables.
In the Studio, we can join the data within the database extract component, using the database itself to do the work or outside of a component, within the job, where it is Java that does the data crunching. Let's take a look at examples of both.
Joining within the database component
Our first example is straightforward and presents an SQL query to the database component that ...
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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.