October 2002
Beginner
864 pages
18h 41m
English
Content preview from Sams Teach Yourself SQL in 21 Days, Fourth Edition
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Day 4. Molding Data with Built-in Functions
Today we discuss functions. Functions in SQL enable you to perform feats such as determining the sum of a column or converting all the characters of a string to uppercase. By the end of the day, you will understand and be able to use all the following:
Aggregate functions
Date and time functions
Arithmetic functions
Character functions
Conversion functions
Miscellaneous functions
These functions greatly increase your ability to manipulate the information you retrieved using the basic functions of SQL that were described earlier this week. The first five aggregate functions, COUNT, SUM, AVG, MAX, and MIN, are defined in the ANSI standard. Most implementations of SQL have extensions to these aggregate functions, ...
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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.