April 2024
Beginner
832 pages
20h 32m
English
book
Data Analytics & Visualization All-in-One For Dummies
by Jack A. Hyman, Luca Massaron, Paul McFedries, John Paul Mueller, Lillian Pierson, Jonathan Reichental, Joseph Schmuller, Alan R. Simon, Allen G. Taylor
Content preview from Data Analytics & Visualization All-in-One For Dummies
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Chapter 3
Values, Variables, Functions, and Expressions
IN THIS CHAPTER
Discovering valid values for table columns
Summarizing data with set functions
Dissecting data with value functions
Converting data types
This chapter describes the tools that ISO/IEC standard SQL provides to operate on data. In addition to specifying the value of a data item, you can slice and dice an item in a variety of ways. Instead of just retrieving raw data as it exists in the database, you can preprocess it to deliver just the information you want, in the form that you want it.
Entering Data Values
After you’ve created a database table, the next step is to enter data into it. SQL supports a number of different data types. Within any specific data type, the data can take any of several forms. The five different forms that can appear in table rows are
- Row values
- Column references
- Literal values
- Variables
- Special variables
Each form is discussed in turn throughout this section.
Row values have multiple parts
A row value includes the values of all the data in all the columns in a row in a table. It ...
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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.