August 2010
Intermediate to advanced
526 pages
23h 39m
English
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Name
avg() — Compute the numerical average
Common Usage
avg( number )Description
The avg() aggregate computes the average (mean)
numeric value for all non-NULL
values. The aggregate attempts to convert any text or
BLOB values into a numeric value. If a conversion is not
possible, those rows will be counted with a value of 0.number
If all the
values are NULL, number
avg() will return a NULL.
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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.