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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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Make a float only show two decimal places
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answered Feb 18 '09 at 10:30
Andrew GrantAndrew Grant
55.8k2222 gold badges126126 silver badges139139 bronze badges
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What's the opposite of head? I want all but the first N lines of a file
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-n, --lines=K output the last K lines, instead of the last 10;
or use -n +K to output lines starting with the Kth
So to filter out the first 2 lines, -n +3 should give you the output you are looking for (start from 3rd).
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How can I change my Cygwin home folder after installation?
...the current user the you can use -c instead: sinewalker.wordpress.com/2006/10/27/cygwin-users-and-groups
– Ben Challenor
Oct 17 '12 at 12:21
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How do I convert a git repository to mercurial?
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SpoikeSpoike
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sed whole word search and replace
...U sed OK
– Oleg Mazko
Aug 25 '16 at 10:19
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What is the difference between substr and substring?
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Sequelize Unknown column '*.createdAt' in 'field list'
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edited Jun 4 at 1:10
answered Oct 7 '18 at 3:51
zhu...
iOS 7 sizeWithAttributes: replacement for sizeWithFont:constrainedToSize
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answered May 22 '15 at 10:31
testingtesting
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'python' is not recognized as an internal or external command [duplicate]
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– Dave Stallberg
Jul 30 '13 at 17:10
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