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For the purposes of this discussion, row_number() is just as good
as rank(), and its behavior is easier to understand and describe.
So let's switch the examples to using row_number().
Along the way to checking the results given in the tutorial,
I found it helpful to extract the empsalary table we use in the
regression tests, which is evidently the same data that was used
to make these results. So I shoved that into advanced.source
to improve the coverage of that file a little. (There's still
several pages of the tutorial that are not included in it,
but at least now 3.5 Window Functions is covered.)
Suggested-by: "David G. Johnston" <[email protected]>
Author: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/[email protected]
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This is a follow-on patch to 92c12e46d5. In that patch, we renamed
"altitude" to "elevation" in the docs, based on these details:
https://mapscaping.com/blogs/geo-candy/what-is-the-difference-between-elevation-relief-and-altitude
This renames the tutorial SQL files to match the documentation.
Reported-by: [email protected]
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 9.6
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Reported-by: Daniel Gustafsson
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: master
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Seem to remember someone posting to one of the lists a while back
that the tutorial code wouldn't compile and/or run. Found four
problems with it that will let it run.
1. Tutorial makefile had a recursive use of DLOBJS.
2. Some tutorial needed semi-colons added to many statements.
3. Complex tutorial didn't clean up after itself.
4. Advanced had a time-travel example. Commented it out and
put a line pointing the user to contrib/spi/README.
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