May 2005
Intermediate to advanced
352 pages
14h 39m
English
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Name
VARIANCE( )
Synopsis
VARIANCE(column)The function returns the standard variance of
column, based on the rows selected as a
whole population. Use it in conjunction with the GROUP
BY clause. This function is available as of Version 4.1 of
MySQL.
SELECT col1, VARIANCE(col2) FROM table1
GROUP BY col1;
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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.