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How to drop multiple columns in postgresql
I want to drop 200 columns in my table in PostgreSQL. I tried:
2 Answers
2
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Crop MP3 to first 30 seconds
...and it also takes longer to do.
Here's a command line that will slice to 30 seconds without transcoding:
ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3
The -acodec switch tells ffmpeg to use the special "copy" codec which does not transcode. It is lightning fast.
NOTE: the command w...
How can you make a custom keyboard in Android?
...xml folder (if the folder does not exist, created it).
<?xml version="1.0" encoding="utf-8"?>
<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
android:keyWidth="15%p"
android:keyHeight="15%p" >
<Row>
<Key android:codes="1" android:key...
How does the bitwise complement operator (~ tilde) work?
...ple, here's the representation of -2 in two's complement: (8 bits)
1111 1110
The way you get this is by taking the binary representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets u...
Mixins vs. Traits
...traditional" traits ?
– Sergio
Sep 20 '12 at 16:31
4
Yes, these are not "traditional", they are c...
could not resolve host github.com error while cloning remote repository in git
... I am, in a company behind a NTLM proxy, all you need to do is:
unzip px-v0.4.0.zip anywhere you want
change the px.ini config file (put it in %USERPROFILE%), chaging the server line:
[proxy]
server = proxy.my.company:8080 <= use your company proxy:port
listen = 127.0.0.1
port = 3128
use HTTP...
Elastic search, multiple indexes vs one index and types for different data sets?
...
190
There are different implications to both approaches.
Assuming you are using Elasticsearch's de...
How to change field name in Django REST Framework
...
PatDuJour
83688 silver badges2020 bronze badges
answered Apr 9 '14 at 9:49
erthalionerthalion
2,12611 gold b...
What is the proper declaration of main?
...ogram. argc is the number of arguments in the argv array.
Usually, argv[0] contains the name of the program, but this is not always the case. argv[argc] is guaranteed to be a null pointer.
Note that since an array type argument (like char*[]) is really just a pointer type argument in disguise, ...
How do I best silence a warning about unused variables?
... bar(param1);
}
Or,
#define UNUSED(expr) do { (void)(expr); } while (0)
...
void foo(int param1, int param2)
{
UNUSED(param2);
bar(param1);
}
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