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Two single-column indexes vs one two-column index in MySQL?
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If you have two single column indexes, only one of them will be used in your example.
If you have an index with two columns, the query might be faster (you should measure). A two column index can also be used as a single col...
What to do with branch after merge
...ranch1
Additionally, git will warn you (and refuse to delete the branch) if it thinks you didn't fully merge it yet. If you forcefully delete a branch (with git branch -D) which is not completely merged yet, you have to do some tricks to get the unmerged commits back though (see below).
There are...
When should I use git pull --rebase?
...efault and others who insist never to use it. I believe I understand the difference between merging and rebasing, but I'm trying to put this in the context of git pull . Is it just about not wanting to see lots of merge commit messages, or are there other issues?
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How to find index of all occurrences of element in array?
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The .indexOf() method has an optional second parameter that specifies the index to start searching from, so you can call it in a loop to find all instances of a particular value:
function getAllIndexes(arr, val) {
var indexes = [], i = -1;
while ((i = arr.indexOf(val, i+1)) != -1)...
Batch file. Delete all files and folders in a directory
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Note: If you want to bypass "Are you sure you want to delete..." prompt youll need to add /F Q flags: del . /F /Q
– Rhyuk
Apr 22 '13 at 20:41
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Populate data table from data reader
...ng in C# (MS VS2008) and have a question more about proper design than specific code.
5 Answers
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What is the point of noreturn?
...ilers to make some optimizations and generate better warnings. For example if f has the noreturn attribute, the compiler could warn you about g() being dead code when you write f(); g();. Similarly the compiler will know not to warn you about missing return statements after calls to f().
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Adding a public key to ~/.ssh/authorized_keys does not log me in automatically
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You need to verify the permissions of the authorized_keys file and the folder / parent folders in which it is located.
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
For more information see this page.
You may also need to change/ver...
Closing WebSocket correctly (HTML5, Javascript)
...as wondering, how do I close the connection gracefully? Like, what happens if user refreshes the page, or just closes the browser?
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Find all elements on a page whose element ID contains a certain text using jQuery
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If you're finding by Contains then it'll be like this
$("input[id*='DiscountType']").each(function (i, el) {
//It'll be an array of elements
});
If you're finding by Starts With then it'll be like this
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