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quick random row selection in Postgres
I have a table in postgres that contains couple of millions of rows. I have checked on the internet and I found the following
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In git how is fetch different than pull and how is merge different than rebase?
... I just pul and experiment/explore, and if it was problematic, do a hard reset?
– user285372
Jun 9 '18 at 17:00
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show 3 more comments
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convert ArrayList to JSONArray
I have an ArrayList that I use within an ArrayAdapter for a ListView. I need to take the items in the list and convert them to a JSONArray to send to an API. I've searched around, but haven't found anything that explains how this might work, any help would be appreciated.
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How to multiply duration by integer?
...e your variable addOneHrDuration of time time.Duration but then proceed to set it to 3600 ns not to one hour. A time.Duration happens to have base units of nanoseconds. To actually get a one hour duration you could do something like: const oneHourDuration = 60 * time.Hour (or 3600 * time.Second or t...
Programmer-friendly search engine? [closed]
...find a smart way of indexing only "programming-related" pages, than we are set: I be
Most efficient way to store thousand telephone numbers
...= 1375 bytes.
If we want to know whether a certain phone number is in our set, we first check if the first five binary digits match the five digits we have stored. Then we split the remaining five digits into its top m=7 bits (which is, say, the m-bit number M) and its lower k=10 bits (the number K...
How do I remove newlines from a text file?
I have the following data, and I need to put it all into one line.
19 Answers
19
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Use Expect in a Bash script to provide a password to an SSH command
...king=no -oCheckHostIP=no usr@$myhost.example.com
# Use the correct prompt
set prompt ":|#|\\\$"
interact -o -nobuffer -re $prompt return
send "my_password\r"
interact -o -nobuffer -re $prompt return
send "my_command1\r"
interact -o -nobuffer -re $prompt return
send "my_command2\r"
interact
Sample ...
How do I iterate through each element in an n-dimensional matrix in MATLAB?
...o stuff like the following, which creates an N-dimensional array, and then sets all the elements on the "diagonal" to be 1.
d = zeros( 3, 4, 5, 6 ); % Let's pretend this is a user input
nel = numel( d );
sz = size( d );
szargs = cell( 1, ndims( d ) ); % We'll use this with ind2sub in the loop
for i...
Accessing bash command line args $@ vs $*
...n the special parameters are quoted. Let me illustrate the differences:
$ set -- "arg 1" "arg 2" "arg 3"
$ for word in $*; do echo "$word"; done
arg
1
arg
2
arg
3
$ for word in $@; do echo "$word"; done
arg
1
arg
2
arg
3
$ for word in "$*"; do echo "$word"; done
arg 1 arg 2 arg 3
$ for wo...