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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 some other answers propose.
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Asynchronous shell commands
I'm trying to use a shell script to start a command. I don't care if/when/how/why it finishes. I want the process to start and run, but I want to be able to get back to my shell immediately...
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How to get the first element of an array?
...x of 0. You know what they say about assumption...
– Andy
Aug 9 '15 at 16:19
16
@Andy There were...
How do I decompile a .NET EXE into readable C# source code?
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Reflector and its add-in FileDisassembler.
Reflector will allow to see the source code. FileDisassembler will allow you to convert it into a VS solution.
shar...
Why is IntelliJ 13 IDEA so slow after upgrading from version 12?
... 12.
What worked for me was editing the idea64.vmoptions in the bin folder and setting the max heap to 8 GB (was 512 MB) and the Max PermGen to at least 1GB (was 300MB).Example below:
-Xms128m
-Xmx8192m
-XX:MaxPermSize=1024m
Upon restart it was much faster.
For IntelliJ 2020 going back to 2017 o...
Select random lines from a file
In a Bash script, I want to pick out N random lines from input file and output to another file.
4 Answers
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What is the difference between `git fetch origin` and `git remote update origin`?
...no difference when used like this.
remote update is a very high-level command - it supports grouped remotes (remotes.<group> = <list>), and updating all remotes (except those with remote.<name>.skipDefaultUpdate set), but not any of the more specific options of fetch. Under the ho...
How to fix committing to the wrong Git branch?
...mit to the wrong branch.
How do I undo the last commit in my master branch and then take those same changes and get them into my upgrade branch?
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How to install APK from PC?
I want to install an APK from PC to Android device. And because of user's Android and generally technical skills, I need to do it as automatically (silently) as possible. So how do I send an APK from PC to Android and start install there?
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PHP Replace last occurrence of a String in a String?
... can't be made it returns the original $subject, just like substr_replace and str_replace do.
– Mischa
Jul 12 '13 at 0:58
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