March 2009
Intermediate to advanced
832 pages
23h 49m
English
book
Inside Microsoft® SQL Server® 2008: T-SQL Querying
by Lubor Kollar Itzik Ben-Gan Dejan Sarka, and Steve Kass
Content preview from Inside Microsoft® SQL Server® 2008: T-SQL QueryingBecome 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,
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Chapter 2. Set Theory and Predicate Logic
Steve Kass
This chapter contains a brief introduction to two cornerstones of mathematics: set theory and predicate logic, which are intimately connected to the world of databases. Database tables represent sets of facts, and database queries produce result sets based on query predicates.
The objects of study in logic are propositions—statements of fact that are either true or false—and propositional functions, which are open statements with one or more unspecified values. Database tables hold representations of statements of fact, and query predicates are propositional functions.
Later in this book, you’ll use logical set-based thinking to write a T-SQL SELECT query to return the following result set: “all ...
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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.