August 2010
Intermediate to advanced
526 pages
23h 39m
English
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Name
count() — Count the number of rows
Common Usage
count( expression )
count( * )Description
The count() aggregate counts the number of rows
with a non-NULL
. If expression
is given as an asterisk character (expression
*), the total number of rows in
an aggregate group will be returned, regardless of value. In
some situations, the computation for the count( * ) syntax can be
optimized and the result value can be computed without an actual
data scan.
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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.