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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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show 3 more comments
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C# generic type constraint for everything nullable
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– Matthew Watson
Mar 16 '17 at 10:30
5
Guidelines aren't absolutes. If you want t...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
...ttribute__((__packed__)) LocalFileHeader {
uint32_t signature;
uint16_t minVersion, flag, method, modTime, modDate;
uint32_t crc32, compressedSize, uncompressedSize;
uint16_t nameLength, extraLength;
};
The packed attribute prevents the compiler from aligning the fields according t...
Mongo interface [closed]
... Justin JenkinsJustin Jenkins
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uwsgi invalid request block size
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edited Aug 16 '18 at 5:55
Dmitry P.
9399 bronze badges
answered Nov 15 '14 at 0:54
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How to set selected value on select using selectpicker plugin from bootstrap
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Tom SarduyTom Sarduy
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How to configure Ruby on Rails with no database?
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RSKRSK
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onKeyPress Vs. onKeyUp and onKeyDown
...n't fire.
– Tony Merryfield
Jan 19 '16 at 12:17
@Tony Merryfield - link is working fine for me, I just checked it agai...
How do I give text or an image a transparent background using CSS?
...r me :(
– philfreo
Nov 11 '09 at 18:16
5
This post shows how to do it in IE8:robertnyman.com/2010...