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How can I select rows with most recent timestamp for each key value?
...i.e. latest timestamp) for each unique sensor ID.
In my use case I have ~10M readings from ~1K sensors, so trying to join the table with itself on a timestamp-based filter is very resource-intensive; the above takes a couple of seconds.
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Best data type for storing currency values in a MySQL database
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edited Apr 28 '15 at 10:12
shA.t
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answered Ma...
Why are quaternions used for rotations?
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Peter AlexanderPeter Alexander
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How can I use a search engine to search for special characters? [closed]
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Alex D
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answered Nov 22 '11 at 19:53
dncranedncrane
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What is the best way to implement nested dictionaries?
...ow:
>>> import pprint
>>> pprint.pprint(vividict, width=40)
{'new jersey': {'mercer county': {'plumbers': 3,
'programmers': 81},
'middlesex county': {'programmers': 81,
'salesmen': 62}},
'new yo...
Git Diff with Beyond Compare
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edited Aug 14 '17 at 8:40
wonea
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answered A...
Xcode without Storyboard and ARC
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150
Create a project with an Empty application and Add any viewcontroller (i added TestViewControlle...
How can I maximize the editor pane in IntelliJ IDEA?
...nd tab bar will still be visible.
I'm using IntelliJ 11.1.2 on Kubuntu 12.04 LTS with the Default keymap.
14.0.3 on MacOS X
It's Cmd + Shift + F12 in IntelliJ IDEA 14.0.3 on MacOS X.
UPDATE on 2015-03-24:
IntelliJ IDEA 14.1 now has support for Distraction Free Mode. You can invoke it by clicking...
Xcode 4 hangs at “Attaching to (app name)”
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104
Fixed it!! Hopefully this helps some people avoid a very frustrating couple hours. I solved thi...
Updating a local repository with changes from a GitHub repository
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edited Apr 9 '19 at 0:02
Peter Mortensen
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