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LISTAGG in Oracle to return distinct values
... row_number() over (partition by col1, col2 order by col1) as rn
from foo
order by col1,col2
)
where rn = 1
group by col1;
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How to change the name of a Django app?
...tem itself doesn't care about the name. The column DEFAULT stores an OID ('foo_pkey_seq'::regclass), you can change the name of the sequence without breaking that - the OID stays the same.
– Konstantine Kalbazov
May 1 '15 at 14:07
...
Reuse Cucumber steps
...precated, use 'step' to call other steps instead:/path/to/step_definitions/foo_steps.rb:631:in `block in '
". See the cucumber wiki for details.
The gist of the change is that you should now use the step or steps methods.
When /^I make all my stuff shiny$/
step "I polish my first thing"
end
Whe...
What is the difference between children and childNodes in JavaScript?
...ample would be:
let el = document.createElement("div");
el.textContent = "foo";
el.childNodes.length === 1; // Contains a Text node child.
el.children.length === 0; // No Element children.
Most of the time, you want to use .children because generally you don't want to loop over Text or Comment...
C# version of java's synchronized keyword?
..., I don't like the implementation of MethodImpl as it locks this or typeof(Foo) - which is against best practice. The preferred option is to use your own locks:
private readonly object syncLock = new object();
public void SomeMethod() {
lock(syncLock) { /* code */ }
}
Note that for field-like...
Differences between action and actionListener
...xml with a custom implementation:
<exception-handlerfactory>
com.foo.myExceptionHandler
</exception-handlerfactory>
Instead of listening globally, a single bean can also listen to these events. The following is a proof of concept of this:
@ManagedBean
@RequestScoped
public class M...
How do I execute a command and get the output of the command within C++ using POSIX?
...er, so the pipe might not be properly closed.
– Fred Foo
May 19 '12 at 20:27
6
@Yasky: When the p...
What's the best name for a non-mutating “add” method on an immutable collection?
...te an ImmutableStack and give it a completely different name, lets call it Foo/Fop, you've just added more work for them to use your collection.
Edit: Response to Plus Edit
I see where you're going with Plus. I think a stronger case would actually be Minus for remove. If I saw the following I ...
How to install a node.js module without using npm?
...;version range>
Can specify one or more: npm install ./foo.tgz bar@stable /some/folder
If no argument is supplied and ./npm-shrinkwrap.json is
present, installs dependencies specified in the shrinkwrap.
Otherwise, installs dependen...
String literals and escape characters in postgresql
...etter E (upper or lower case) just before the opening single quote, e.g. E'foo'. (When continuing an escape string constant across lines, write E only before the first opening quote.) Within an escape string, a backslash character (\) begins a C-like backslash escape sequence, in which the combinati...