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How do you join on the same table, twice, in mysql?
... DOM_URL fields from both LEFT JOINS of the DOMAIN table, referencing them by the table alias for each joined in reference to the Domains table, and alias them as the ToURL and FromUrl.
For more info about aliasing in SQL, read here.
...
JavaScript function in href vs. onclick
...vascript is pretty simple. Get the DOM node with obj = document.getElementById(), then set obj.onclick = foo
– Matt Bridges
Jul 1 '09 at 19:24
1
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Where is Python's sys.path initialized from?
...s used instead.
Otherwise, these sys.prefix and sys.exec_prefix are found by walking backwards
from the location of sys.executable, or the home directory given by pyvenv.cfg if any.
If the file lib/python<version>/dyn-load is found in that directory
or any of its parent directories, that dir...
How do I get jQuery to select elements with a . (period) in their ID?
...elect(data);
});
});
});
Also check out How do I select an element by an ID that has characters used in CSS notation? on the jQuery FAQ.
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Detecting endianness programmatically in a C++ program
...'t like the method based on type punning - it will often be warned against by compiler. That's exactly what unions are for !
bool is_big_endian(void)
{
union {
uint32_t i;
char c[4];
} bint = {0x01020304};
return bint.c[0] == 1;
}
The principle is equivalent to the t...
What is the IntelliJ shortcut to create a local variable?
...
Yep! This is the Introduce Variable refactoring. By default, select some text, and then hit Ctrl + Alt + V (for Mac: ⌘+⌥+V). If the expression is incomplete or invalid, IntelliJ will still make a good guess about what you meant and try to fix it for you.
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Where are Docker images stored on the host machine?
...cker directory vary depending on the driver Docker is using for storage.
By default this will be aufs but can fall back to overlay, overlay2, btrfs, devicemapper or zfs depending on your kernel support. In most places this will be aufs but the RedHats went with devicemapper.
You can manually set ...
Why does InetAddress.isReachable return false, when I can ping the IP address?
...sjdosgoogle.com1234sd"
InetAddress[] addresses = InetAddress.getAllByName("www.google.com");
for (InetAddress address : addresses) {
if (address.isReachable(10000))
{
System.out.println("Connected "+ address);
}
else
{
Sy...
Namespace and class with the same name?
... is ambiguous between Foo.Foo and
Bar.Foo. Bummer. I guess I’ll fix that by fully qualifying the name:
class C { Foo.Foo foo; }
This now gives the ambiguity error “Foo in
Foo.Foo is ambiguous between Foo.Foo and Bar.Foo”. We still don’t know
what the first Foo refers to, and until we ca...
accepting HTTPS connections with self-signed certificates
...tpClient lib, but the problem is that, since the certificate isn't signed by a recognized Certificate Authority (CA) like Verisign , GlobalSIgn , etc., listed on the set of Android Trusted Certificates, I keep getting javax.net.ssl.SSLException: Not trusted server certificate .
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