August 2024
Intermediate to advanced
380 pages
10h 16m
Spanish
Content preview from Aprender SQL, 3ª Edición
Become 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,
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.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.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.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.
Capítulo 16. Funciones analíticas
Este trabajo se ha traducido utilizando IA. Agradecemos tus opiniones y comentarios: translation-feedback@oreilly.com
Los volúmenes de datos han crecido a un ritmo asombroso, y las organizaciones tienen dificultades para almacenarlos todos, por no hablar de intentar darles sentido. Aunque el análisis de datos se ha realizado tradicionalmente fuera del servidor de bases de datos, utilizando herramientas o lenguajes especializados como Excel, R y Python, el lenguaje SQL incluye un sólido conjunto de funciones útiles para el procesamiento analítico. Si necesitas generar clasificaciones para identificar a los 10 mejores vendedores de tu empresa o si estás generando un informe financiero para tu cliente y necesitas calcular medias móviles de tres meses, puedes utilizar las funciones analíticas incorporadas de SQL para realizar este tipo de cálculos.
Conceptos de función analítica
Una vez que el servidor de la base de datos ha completado todos los pasos necesarios para evaluar una consulta, incluidas la unión, el filtrado, la agrupación y la ordenación, el conjunto de resultados está completo y listo para ser devuelto a la persona que llama. Imagina que pudieras detener la ejecución de la consulta en este punto y dar un paseo por el conjunto de resultados mientras aún se mantiene en memoria; ¿qué tipos de análisis podrías querer hacer? Si tu conjunto de resultados contiene datos de ventas, quizá quieras generar clasificaciones de vendedores o regiones, ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.