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What is an index in SQL?
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"The index can also be a UNIQUE index..." Just to confirm with you, does that means index can al be Non-UNIQUE? I always thought its UNIQUE. I'm quite new to SQL, pardon me
– Daniel Kurniadi
May 16 at 5:01
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What are the differences between B trees and B+ trees?
... @EvanCarroll Database system concepts 5th, maybe you need to confirm with the author :)
– camino
Apr 20 '18 at 20:19
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Uploading images using Node.js, Express, and Mongoose
...best to upload to a tmp folder and then move into your public folder after confirming the file is not a Trojan.
– srquinn
Sep 24 '13 at 16:10
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Set a persistent environment variable from cmd.exe
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Indeed SET TEST_VARIABLE=value works for current process only, so SETX is required. A quick example for permanently storing an environment variable at user level.
In cmd, SETX TEST_VARIABLE etc. Not applied yet (echo %TEST_VARIABLE% ...
Are unused CSS images downloaded?
...dent, since it's how they decide to implement the spec, however in a quick test here:
Chrome: Doesn't
FireFox: Doesn't
Safari: Doesn't
IE8: Doesn't
IE7: Doesn't
IE6: Unknown (Can someone test and comment?)
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How do you easily horizontally center a using CSS? [duplicate]
...lly by 50% of the div's own width.
It is easy to imagine this process to confirm that the div would be horizontally centered eventually. As a bonus, you can center vertically at no additional cost:
.centered-vertically {
position: relative;
top: 50%;
transform: translateY(-50%);
}
T...
How to link a Facebook app with an existing fan page
... page
PS: May be needed your page and app share the same name, but can't confirm this.
On your app
Access your app from the Facebook Developers apps panel.
Access Settings on the left side menu.
Set the category to Apps for pages and hit Save. [@JohnMc mentioned this has to be the only catego...
PopupWindow - Dismiss when clicked outside
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Thanks for @LunaKong's answer and @HourGlass's confirmation. I don't want to make a duplicated comment, but only want to make it clear and concise.
// Closes the popup window when touch outside. This method was written informatively in Google's docs.
mPopupWindow.setOuts...
How to show the “Are you sure you want to navigate away from this page?” when changes committed?
...make changes then you attempt to navigate away from the page, a javascript confirm button shows up and asks: "Are you sure you want to navigate away from this page?" blee blah bloo...
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How to Remove ReadOnly Attribute on File Using PowerShell?
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$file = Get-Item "C:\Temp\Test.txt"
if ($file.attributes -band [system.IO.FileAttributes]::ReadOnly)
{
$file.attributes = $file.attributes -bxor [system.IO.FileAttributes]::ReadOnly
}
The above code snippet is taken from this article
U...