December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 32
Sub-sequences, Regions, Runs, Gaps, and Islands
Abstract
The groups in a GROUP BY do not depend on any orderings. But you will often want to make other groupings which depend on an ordering of some kind. Examples of this sort of data would be ticket numbers, time series data taken at fixed intervals, and the like which can have missing data or sub-sequences that are of interest.
Keywords
Sub-sequences
Regions
Runs
Gaps
Islands
Linear interpolation
NULL
We have already talked about the GROUP BY clause in queries. The groups in a GROUP BY do not depend on any orderings. But you will often want to make other groupings which depend on an ordering of some kind. Examples of this sort of data would be ticket numbers, time series data ...
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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.