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LISTAGG in Oracle to return distinct values
...
19c and later:
select listagg(distinct the_column, ',') within group (order by the_column)
from the_table
18c and earlier:
select listagg(the_column, ',') within group (order by the_column)
from (
select distinct the_colum...
What is the difference between statically typed and dynamically typed languages?
... advantage here is that all kinds of checking can be done by the compiler, and therefore a lot of trivial bugs are caught at a very early stage.
Examples: C, C++, Java, Rust, Go, Scala
Dynamically typed languages
A language is dynamically typed if the type is associated with run-time values, and ...
Bring element to front using CSS
...ng images to front using CSS . I've already tried setting z-index to 1000 and position to relative, but it still fails.
4 ...
regex.test V.S. string.match to know if a string matches a regular expression
... String )
Executes the search for a match between a regular expression and a specified string. Returns true or false.
string.match( RegExp )
Used to retrieve the matches when matching a string against a regular expression. Returns an array with the matches or null if there are none.
Sinc...
How do MySQL indexes work?
...at's where the name came from):
Let's say you have a book about databases and you want to find some information about, say, storage. Without an index (assuming no other aid, such as a table of contents) you'd have to go through the pages one by one, until you found the topic (that's a full table s...
When should I use a trailing slash in my URL?
...misused.
Basically the URL format came from the same UNIX format of files and folders, later on, on DOS systems, and finally, adapted for the web.
A typical URL for this book on a Unix-like operating system would be a file path such as file:///home/username/RomeoAndJuliet.pdf, identifying the e...
Auto-loading lib files in Rails 4
...g/application.rb:
config.autoload_paths << Rails.root.join('lib')
and keep the right naming convention in lib.
in lib/foo.rb:
class Foo
end
in lib/foo/bar.rb:
class Foo::Bar
end
if you really wanna do some monkey patches in file like lib/extensions.rb, you may manually require it:
in...
UICollectionView Set number of columns
...he default is set to 3 (iPhone/portrait). I've looked at the documentation and can't seem to find a concise answer.
17 Answ...
How can I set up an editor to work with Git on Windows?
I'm trying out Git on Windows . I got to the point of trying "git commit" and I got this error:
33 Answers
...
Remove .php extension with .htaccess
Yes, I've read the Apache manual and searched here. For some reason I simply cannot get this to work. The closest I've come is having it remove the extension, but it points back to the root directory. I want this to just work in the directory that contains the .htaccess file.
...