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Why is LINQ JOIN so much faster than linking with WHERE?
...h combination of rows (n1 * n2 * n3 * n4)
The Join operator takes the rows from the first tables, then takes only the rows with a matching key from the second table, then only the rows with a matching key from the third table, and so on. This is much more efficient, because it doesn't need to perfor...
Remove specific commit
...ry.
The definition of "adjacent" is based on the default number of lines from a context diff, which is 3. So if 'myfile' was constructed like this:
$ cat >myfile <<EOF
line 1
junk
junk
junk
junk
line 2
junk
junk
junk
junk
line 3
EOF
$ git add myfile
$ git commit -m "initial check-in"
1...
Byte order mark screws up file reading in Java
...;
* <p>Use the {@link #skipBOM()} method to remove the detected BOM from the
* wrapped <code>InputStream</code> object.</p>
*/
public class UnicodeBOMInputStream extends InputStream
{
/**
* Type safe enumeration class that describes the different types of Unicode
*...
Reserved keywords in JavaScript
...t mentioned in neither the ES5 spec nor the ES6 draft. Where did that come from?
– Vladimir Panteleev
Oct 6 '13 at 5:10
2
...
Best way to create a simple python web service [closed]
...d like to create a very simple web service that exposes some functionality from an existing python script for use within my company. It will likely return the results in csv. What's the quickest way to get something up? If it affects your suggestion, I will likely be adding more functionality to thi...
Do Git tags only apply to the current branch?
...anches - they only ever identify a commit.
That commit can be pointed to from any number of branches - i.e., it can be part of the history of any number of branches - including none.
Therefore, running git show <tag> to see a tag's details contains no reference to any branches, only the ID ...
Why shouldn't `'` be used to escape single quotes?
... is on the official list of valid HTML 4 entities, but &apos; is not.
From C.16. The Named Character Reference ':
The named character reference &apos;
(the apostrophe, U+0027) was
introduced in XML 1.0 but does not
appear in HTML. Authors should
therefore use &#39; instead o...
Set android shape color programmatically
...awable is an oval and is the background of an ImageView
Get the Drawable from imageView using getBackground():
Drawable background = imageView.getBackground();
Check against usual suspects:
if (background instanceof ShapeDrawable) {
// cast to 'ShapeDrawable'
ShapeDrawable shapeDrawabl...
What is the difference between a var and val definition in Scala?
...and. That's the kind of object management that immutability makes you free from.
Now, let's covert it to an immutable.Queue:
def toNum(q: scala.collection.immutable.Queue[Int]) = {
def recurse(qr: scala.collection.immutable.Queue[Int], num: Int): Int = {
if (qr.isEmpty)
num
else {
...
How do I discard unstaged changes in Git?
...urrent index for the current directory, throwing away all changes in files from the current directory downwards.
git checkout .
or this which checks out all files from the index, overwriting working tree files.
git checkout-index -a -f
...