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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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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...
What is the difference between a URI, a URL and a URN?
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Only URIs with the urn: scheme are URNs. A URI could be a classic URL, a URN, or just a URI that doesn't start with "urn:" and doesn't refe...
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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How to encode the filename parameter of Content-Disposition header in HTTP?
...74 upvotes.
– Antti Haapala
Sep 11 '16 at 21:33
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How to configure Ruby on Rails with no database?
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RSKRSK
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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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What's the canonical way to check for type in Python?
...drik Johansson
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