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What is the difference between “INNER JOIN” and “OUTER JOIN”?
...n as an anti semi join.
It is important to select a column for the IS NULL test that is either not nullable or for which the join condition ensures that any NULL values will be excluded in order for this pattern to work correctly and avoid just bringing back rows which happen to have a NULL value fo...
Is null reference possible?
...tr ?
Edit: Corrected several mistypes and added if-statement in main() to test for the cast-to-pointer operator actually working (which I forgot to.. my bad) - March 10 2015 -
// Error.h
class Error {
public:
static Error& NOT_FOUND;
static Error& UNKNOWN;
static Error& NONE; // ...
How to use java.net.URLConnection to fire and handle HTTP requests?
...the parameters will be available by HttpServletRequest#getParameter().
For testing purposes, you can print the response body to stdout as below:
try (Scanner scanner = new Scanner(response)) {
String responseBody = scanner.useDelimiter("\\A").next();
System.out.println(responseBody);
}
Fir...
Elegant setup of Python logging in Django
...default with django-admin createproject v1.3 - mileage might change with latest django versions:
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'handlers': {
'mail_admins': {
'level': 'ERROR',
'class': 'django.utils.log.AdminEmailHandler',
...
Why does ContentResolver.requestSync not trigger a sync?
...er is working, and my sync works when I trigger it from the Dev Tools Sync Tester application, however when I call ContentResolver.requestSync(account, authority, bundle) from my ContentProvider, my sync is never triggered.
...
Why does git perform fast-forward merges by default?
...o make a certain operation easier (rebasing, likely, or quick patching and testing), and then immediately delete once I'm done.
That means it likely should be absorbed into the topic branch it forked from, and the topic branch will be merged as one branch. No one needs to know what I did internall...
Declaring abstract method in TypeScript
... ){
}
doStuff(node: N){
this.implementation.generateStuff(thing);
}
}
export interface IFilterWidget<N extends GraphView.BaseNode, L extends GraphView.BaseLink<GraphView.BaseNode>> extends FilterWidget<N, L> {
generateStuff(node: N): string;
}
...
CORS Access-Control-Allow-Headers wildcard being ignored?
...w-Headers does accept wildcards. It's also wrong, wildcard works for me (I tested only with Chrome)
This take me half day to figure out the issue.
Happy coding
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Can a local variable's memory be accessed outside its scope?
...
Haha. Francis Bacon, one of Britain's greatest essayists, whom some people suspect wrote Shakespeare's plays, because they can't accept that a grammar school kid from the country, son of a glover, could be a genius. Such is the English class system. Jesus said, 'I am...
Why are regular expressions so controversial? [closed]
...id input, it's to fail to match invalid input. Techniques to do "negative tests" for regular expressions are not very advanced, or at least not widely used.
This goes to the point of regular expressions being hard to read. Just by looking at a regular expression, it takes a lot of concentration to ...