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What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
...
Assuming you are avoiding nulls, they are all ways of writing an anti-join using Standard SQL.
An obvious omission is the equivalent using EXCEPT:
SELECT a FROM table1
EXCEPT
SELECT a FROM table2
Note in Oracle you need to use the MINUS oper...
setTimeout / clearTimeout problems
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You need to declare timer outside the function. Otherwise, you get a brand new variable on each function invocation.
var timer;
function endAndStartTimer() {
window.clearTimeout(timer);
//var millisecBeforeRedirect = 10000;
timer = window.setTimeo...
git diff between cloned and original remote repository
... When I tried it with git 2.7.4 the "git diff master foobar/master" did not show differences. I looks to me like it compares my local copy ("master") with the repo given as 1st argument ("master") and in there only diffs the "path/file" "foobar/master". But the command "diff foobar/master" wor...
How can I programmatically generate keypress events in C#?
...se the following method,
[DllImport("user32.dll")]
public static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);
sample code is given below:
const int VK_UP = 0x26; //up key
const int VK_DOWN = 0x28; //down key
const int VK_LEFT = 0x25;
const int VK_RIGHT = 0x27;
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What's the difference between lists enclosed by square brackets and parentheses in Python?
Are they both valid? Is one preferred for some reason?
6 Answers
6
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Spring @PostConstruct vs. init-method attribute
...zing methods are called.
If your bean implements InitializingBean and overrides afterPropertiesSet , first @PostConstruct is called, then the afterPropertiesSet and then init-method.
For more info you can check Spring's reference documentation.
Before JSR 250 specs , usage of init-method in xml w...
How to see which plugins are making Vim slow?
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Best answer! Helped me to identify the slowest plugin that made me angry at every vim start. Thanx :)
– kovpack
Jul 27 '16 at 19:11
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What is the proper declaration of main?
...common to see incorrect programs that declare main with a return type of void; this is probably the most frequently violated rule concerning the main function).
There are two declarations of main that must be allowed:
int main() // (1)
int main(int, char*[]) // (2)
In (1), there ...
Does const mean thread-safe in C++11?
...const is now the equivalent of Java's synchronized?
No. Not at all...
Consider the following overly simplified class representing a rectangle:
class rect {
int width = 0, height = 0;
public:
/*...*/
void set_size( int new_width, int new_height ) {
width = new_width;
hei...
See what process is using a file in Mac OS X
...gh the running apps) but Activity Monitor does show it to be running. Stupid Preview.
– Dave Sag
Aug 15 '12 at 1:27
T...