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 5. Agregações, medidas e DAX
Este trabalho foi traduzido com recurso a IA. Agradecemos o teu feedback e comentários: translation-feedback@oreilly.com
No Capítulo 1, tivemos uma longa conversa sobre o motor de armazenamento e o motor de fórmulas do Power BI. No Capítulo 3, falámos sobre como funciona o motor de armazenamento e o que significa armazenar dados na tua própria instância pessoal dos Serviços de Análise. Agora vamos mergulhar na outra metade do que torna o Power BI especial: o motor de fórmulas.
Fazendo um balanço do nosso progresso até agora, colocámos os nossos dados no Power BI e analisámos a maior parte das visualizações disponíveis no Power BI de imediato. Arrastámos e largámos valores nas visualizações para obter resultados, mas como é que o Power BI sabia o que mostrar?
Este capítulo detalha as funções de agregações, medidas e DAX em relação às visualizações. O que é uma agregação? O que é uma medida? O que é exatamente DAX? Responderemos a todas estas perguntas e explicaremos o que precisas de saber.
Uma cartilha sobre a linguagem DAX
Expressões de análise de dados (DAX) é a linguagem do motor de fórmulas do Analysis Services Tabular e do Power BI. É uma linguagem de consulta multifuncional que pode ser usada para obter resultados específicos ou criar tabelas ou colunas calculadas. Sempre que crias um visual no Power BI, este gera DAX nos bastidores para obter os dados do motor de armazenamento do Power BI.
O DAX é incrivelmente poderoso, mas como tudo ...
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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.