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Postgres: INSERT if does not exist already
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Postgres 9.5 (released since 2016-01-07) offers an "upsert" command, also known as an ON CONFLICT clause to INSERT:
INSERT ... ON CONFLICT DO NOTHING/UPDATE
It solves many of the subtle problems you can run into when using concurrent operation, which so...
How to prevent the activity from loading twice on pressing the button
... singleInstance option.
– Nohus
May 16 '17 at 18:06
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Client to send SOAP request and receive response
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answered Jul 16 '14 at 15:02
Yuliia AshomokYuliia Ashomok
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Apache Spark: The number of cores vs. the number of executors
... Imagine a cluster with six nodes running NodeManagers, each
equipped with 16 cores and 64GB of memory. The NodeManager capacities,
yarn.nodemanager.resource.memory-mb and
yarn.nodemanager.resource.cpu-vcores, should probably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allo...
Javascript: Round up to the next multiple of 5
...in - hacker
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ping response “Request timed out.” vs “Destination Host unreachable”
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answered Mar 3 '14 at 10:16
petchirajanpetchirajan
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Is there an equivalent to background-size: cover and contain for image elements?
...sideration.
– Mike Kormendy
Jan 26 '16 at 17:01
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object-fit is still is not supported in IE. I w...
uwsgi invalid request block size
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edited Aug 16 '18 at 5:55
Dmitry P.
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answered Nov 15 '14 at 0:54
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Check if string contains only digits
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– Константин Ван
Aug 6 '19 at 14:16
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