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How to empty a Heroku database
...eed) into one action by executing this:
$ heroku run rake db:setup
Edit 2014-04-18: rake db:setup doesn't work with Rails 4, it fails with a Couldn't create database error.
Edit 2014-10-09: You can use rake db:setup with Rails 4. It does give you a Couldn't create database error (because the dat...
Why does multiprocessing use only a single core after I import numpy?
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edited Oct 22 '13 at 22:44
answered Mar 26 '13 at 15:36
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Can a CSV file have a comment?
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120
The CSV "standard" (such as it is) does not dictate how comments should be handled, no, it's up...
Is there any difference between GROUP BY and DISTINCT
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26 Answers
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Check for internet connection availability in Swift
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229
As mentioned in the comments, although its possible to use Objective-C libraries in Swift, I w...
Running multiple AsyncTasks at the same time — not possible?
...in what version exactly they changed that.
UPDATE:
Here is what current (2012-01-27) API says on this:
When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parall...
Which is faster: Stack allocation or Heap allocation
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23 Answers
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How do I convert a git repository to mercurial?
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edited Sep 2 '17 at 7:01
aditsu quit because SE is EVIL
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How do I start Mongo DB from Windows?
...starting. It is showing admin web console waiting for connections on port 28017 .
17 Answers
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Mongodb Explain for Aggregation framework
...ve you the desired results (documentation here).
For older versions >= 2.6, you will need to use the explain option for aggregation pipeline operations
explain:true
db.collection.aggregate([
{ $project : { "Tags._id" : 1 }},
{ $unwind : "$Tags" },
{ $match: {$or: [{"Tags._id":"tag1...