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What is a columnar database?
...layer to access the columnar data in an easy fashion).
How do they differ from relational databases?
They generally differ from traditional (row-oriented) databases with regards to ...
performance...
storage requirements ...
ease of modification of the schema ...
...in specific use cases of DBM...
Why does range(start, end) not include end?
...with x and end with y-1. If the programmer wants a for-loop with i ranging from 1 to 3, he has to explicitly add 1. Is this really about convenience?
– armin
Jul 24 '16 at 14:42
...
Generate a random date between two other dates
..., e.g. milliseconds, seconds, hours, days, whatever), subtract the earlier from the later, multiply your random number (assuming it is distributed in the range [0, 1]) with that difference, and add again to the earlier one. Convert the timestamp back to date string and you have a random time in tha...
Get the latest record from mongodb collection
...
Yet another way of getting the last item from a MongoDB Collection (don't mind about the examples):
> db.collection.find().sort({'_id':-1}).limit(1)
Normal Projection
> db.Sports.find()
{ "_id" : ObjectId("5bfb5f82dea65504b456ab12"), "Type" : "NFL", "Head"...
How to remove duplicate values from a multi-dimensional array in PHP
How can I remove duplicate values from a multi-dimensional array in PHP?
19 Answers
19...
How are parameters sent in an HTTP POST request?
...
NOTE: the body is separated from the header by just one blank line.
– Gab是好人
May 2 '16 at 15:15
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git clone from another directory
I am trying to clone repo from another directory.
8 Answers
8
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Why do browsers match CSS selectors from right to left?
CSS Selectors are matched by browser engines from right to left. So they first find the children and then check their parents to see if they match the rest of the parts of the rule.
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Python Process Pool non-daemonic?
...p-level
# multiprocessing module.
import multiprocessing.pool
import time
from random import randint
class NoDaemonProcess(multiprocessing.Process):
# make 'daemon' attribute always return False
def _get_daemon(self):
return False
def _set_daemon(self, value):
pass
...
How to get a file or blob from an object URL?
...
And if you want to directly get a file from the promise, you can generate a file as follows. let file = await fetch(url).then(r => r.blob()).then(blobFile => new File([blobFile], "fileNameGoesHere", { type: "image/png" })
– dbakiu
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