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The Applied SQL Data Analytics Workshop - Second Edition

You're reading from  The Applied SQL Data Analytics Workshop - Second Edition

Product type Book
Published in Feb 2020
Publisher Packt
ISBN-13 9781800203679
Pages 484 pages
Edition 2nd Edition
Languages
Authors (3):
Matt Goldwasser Matt Goldwasser
Profile icon Matt Goldwasser
Upom Malik Upom Malik
Profile icon Upom Malik
Benjamin Johnston Benjamin Johnston
Profile icon Benjamin Johnston
View More author details

Summary

In this chapter, we learned about the incredible power of aggregate functions. We learned about several of the most common aggregate functions and how to use them. We used the GROUP BY clause and saw how it can be used to divide datasets into groups and calculate summary statistics for each group. Then, we learned how to use the HAVING clause to further filter a query. Finally, we used aggregate functions to help us clean data and analyze data quality.

We also learned about window functions. We looked at how to construct a basic window function using OVER, PARTITION BY, and ORDER BY. Then, we looked at how to calculate statistics using window functions, as well as how to adjust a window frame to calculate rolling statistics.

In the next chapter, we will look at how to import and export data in order to utilize SQL with other programs. We will use the COPY command to upload data to our database in bulk. We will also use Excel to process data from our database and then...

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