April 2025
Beginner to intermediate
310 pages
8h 37m
Portuguese (Portugal, Brazil)
Content preview from Aprende a usar o Microsoft Power BI
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Capítulo 3. Importar e modelar os nossos dados
Este trabalho foi traduzido com recurso a IA. Agradecemos o teu feedback e comentários: translation-feedback@oreilly.com
No capítulo anterior, abordámos em pormenor as funções da IU das vistas Relatório e Dados. Este capítulo aborda a IU do Power Query e a vista Modelo. No final deste capítulo, teremos importado os dados da classe de maquete para um ficheiro do Power BI Desktop e utilizado esses dados para demonstrar algumas das capacidades básicas do Power Query para manipulação e modelação de dados.
Na nossa discussão sobre a vista Modelo, demonstraremos o que são relações num modelo de dados e o que fazem. Por fim, analisaremos os dados e tentaremos ativamente fazer coisas com eles. Se gostas de aprender de forma prática, recomendo vivamente que pegues nos dados de amostra e me acompanhes para tentares replicar os passos e os resultados.
Obter os nossos dados
Para o efeito deste exercício , vou trabalhar a partir de três ficheiros do Microsoft Excel que podem ser descarregados a partir de https://oreil.ly/MS-power-BI-files. Vamos colocar-nos na pele de um professor de um curso de visualização de dados na Universidade Cool School. Temos ficheiros que representam a informação que a escola nos forneceu, a informação que nós próprios obtivemos dos nossos alunos e as notas dos alunos nos seus trabalhos.
Começando pelo separador Home no friso da vista de Relatório, vamos usar o atalho do livro de trabalho do Excel e trazer o nosso primeiro ...
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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.