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Insert, on duplicate update in PostgreSQL?
...ubject to race conditions that mean it might still fail with duplicate key error if a row is inserted concurrently, or might terminate with no row inserted when a row is deleted concurrently. A SERIALIZABLE transaction on PostgreSQL 9.1 or higher will handle it reliably at the cost of a very high se...
Mac zip compress without __MACOSX folder?
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It throws an error if the .DS_Store folder is not present in the archive. I suggest an improvement by adding ` || true` after each zip command (such as zip -d "$p" __MACOSX/\* || true into your answer.
– adamsfamily
...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
...olor with an alpha channel was passed into c0 (from) and/or c1 (to).
Minor Error Checking has been added. It's not perfect. It can still crash or create jibberish. But it will catch some stuff. Basically, if the structure is wrong in some ways or if the percentage is not a number or out of scope, it...
What Vim command(s) can be used to quote/unquote words?
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– th3penguinwhisperer
Apr 7 '17 at 11:05
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pycharm convert tabs to spaces automatically
...rting tabs to spaces is default behaviour, however in python IDE is giving errors everywhere because it can't convert tabs to spaces automatically is there a way to achieve this.
...
Can you set a border opacity in CSS?
... { border: 1px solid rgba(255, 0, 0, .5); }
The results were,
Value Error : border Too many values or values are not recognized :
1px solid rgba(255,0,0,0.5 )
Unfortunate that the alpha value (the letter "a" at the end of "rgb") is not accepted by W3C as part of the border color values as...
Chrome Dev Tools: How to trace network for a link that opens a new tab?
... if(link.attributes.target) {
link.attributes.target.value = '_self';
}
});
window.open = function(url) {
location.href = url;
};
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Efficiently test if a port is open on Linux?
... scan for listening daemons,
without sending any data to them. It is an error to use this option
in conjunc-
tion with the -l option.
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How to view the Folder and Files in GAC?
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Install:
gacutil -i "path_to_the_assembly"
View:
Open in Windows Explorer folder
.NET 1.0 - NET 3.5: c:\windows\assembly (%systemroot%\assembly)
.NET 4.x: %windir%\Microsoft.NET\assembly
OR gacutil –l
When you are going to install an as...
What are the mathematical/computational principles behind this game?
...d cs
legalCardSet n m = compatibleCards $ cardCandidates n m
main = mapM_ print [(n, length $ legalCardSet n m) | n<-[m..]]
where m = 8
The resulting maximum number of compatible cards for m=8 pictures per card for different number of pictures to choose from n for the first few n looks lik...