August 2010
Intermediate to advanced
526 pages
23h 39m
English
Content preview from Using SQLite
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Name
IS — Equality test, including NULLs
Syntax
Description
The IS and IS
NOT operators are very similar to the equal (
= or == ) and not equal ( != or <> ) operators. The main
difference is how NULLs are handled. The standard equality tests
are subject to the rules of three valued logic, which will
result in a NULL if either parameter expression is NULL.
The IS operator considers NULL to be “just another
value,” and will always return a 0 or 1. For example, the
expression NULL IS NULL is
considered to be true (1) and
the expression NULL IS 6 is
considered to be false (0).
See Also
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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.