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How do you join on the same table, twice, in mysql?
...alias them as the ToURL and FromUrl.
For more info about aliasing in SQL, read here.
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How To Format A Block of Code Within a Presentation? [closed]
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Unfortunately, this only works for Doc and Spreadsheet and not Presentation, which is what the question is about.
– Some Noob Student
Feb 22 '15 at 3:08
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raw_input function in Python
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The raw_input() function reads a line from input (i.e. the user) and returns a string
Python v3.x as raw_input() was renamed to input()
PEP 3111: raw_input() was renamed to input(). That is, the new input() function reads a line from sys.stdin and re...
Diff output from two programs without temporary files
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Adding a little more to the already good answers (helped me!):
The command docker outputs its help to STD_ERR (i.e. file descriptor 2)
I wanted to see if docker attach and docker attach --help gave the same output
$ docker attach
$ docker attach --hel...
In Swift how to call method with parameters on GCD main thread?
...n versions of Swift use DispatchQueue.main.async to dispatch to the main thread:
DispatchQueue.main.async {
// your code here
}
To dispatch after on the main queue, use:
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
// your code here
}
Older versions of Swift used:
dispatch_asy...
Convert data.frame column format from character to factor
...hange all character variables in your data.frame to factors after you've already loaded your data, you can do it like this, to a data.frame called dat:
character_vars <- lapply(dat, class) == "character"
dat[, character_vars] <- lapply(dat[, character_vars], as.factor)
This creates a vect...
mkdir's “-p” option
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Allows one to list the contents of a directory. It does not allow the reading of files.
i (insert)
Allows one to create new files in a directory or copy new files to a directory.
d (delete)
Allows one to remove files and sub-directories from a directory.
a (administer)
Allows one...
How do I properly clean up Excel interop objects?
...ets);
Marshal.ReleaseComObject(sheet);
POST MORTEM UPDATE:
I want every reader to read this answer by Hans Passant very carefully as it explains the trap I and lots of other developers stumbled into. When I wrote this answer years ago I didn't know about the effect the debugger has to the garbage...
Sharing Test code in Maven
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I was confused when first reading this answer... That's actually because it does not make sense on its own, you should first read the below answer: stackoverflow.com/questions/174560/…
– TanguyP
Jul 28 '15 at 1...
Optimise PostgreSQL for fast testing
...seful reference.
Join the PostgreSQL general mailing list and follow it.
Reading:
Tuning your PostgreSQL server - PostgreSQL wiki
Number of database connections - PostgreSQL wiki
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