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Difference between a theta join, equijoin and natural join
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A theta join allows for arbitrary comparison relationships (such as ≥).
An equijoin is a theta join using the equality operator.
A natural join is an equijoin on attributes that have the same name in each relationship.
Additionally,...
Can multiple different HTML elements have the same ID if they're different elements?
...ntirely possible to have multiple elements with the same ID. It's not generally best practice, but it does have its occasional uses. Everyone seems to cite how would selectors work, well if your going in knowing you'll have conflicting IDs, you use your selectors with a parent, where the IDs under t...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...me (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters?
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fetch in git doesn't get all branches
... manual, and it seems dead straight easy. Strangely it's not working, and all the posts I've found suggest I'm doing the right thing. So I'll subject myself to the lambasting, because there must be something obviously wrong with this:
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Explanation of strong and weak storage in iOS5
... storage. I have read the documentation and other SO questions, but they all sound identical to me with no further insight.
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How to get the list of all installed color schemes in Vim?
Is there a way to get a list of all installed color schemes in Vim? That would make very easy to select one without looking at the .vim directory.
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Detect all changes to a (immediately) using JQuery
...uery code catches immediate changes to any element, and should work across all browsers:
$('.myElements').each(function() {
var elem = $(this);
// Save current value of element
elem.data('oldVal', elem.val());
// Look for changes in the value
elem.bind("propertychange change click...
Reshaping data.frame from wide to long format
...s melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
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Remove all line breaks from a long string of text
Basically, I'm asking the user to input a string of text into the console, but the string is very long and includes many line breaks. How would I take the user's string and delete all line breaks to make it a single line of text. My method for acquiring the string is very simple.
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jQuery first child of “this”
...ilar to find() but only searches one level deep in the hierarchy (which is all you need...):
element.children(":first").toggleClass("redClass");
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