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mongodb group values by multiple fields
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TLDR Summary
In modern MongoDB releases you can brute force this with $slice just off the basic aggregation result. For "large" results, run parallel queries instead for each grouping ( a demonstration listing is at the end of the answer ), or wait for SERVER-9377 to resolve, which would al...
Batch files - number of command line arguments
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Googling a bit gives you the following result from wikibooks:
set argC=0
for %%x in (%*) do Set /A argC+=1
echo %argC%
Seems like cmd.exe has evolved a bit from the old DOS days :)
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PHP Get Site URL Protocol - http vs https
I've written a little function to establish the current site url protocol but I don't have SSL and don't know how to test if it works under https. Can you tell me if this is correct?
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Remove by _id in MongoDB console
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edited Mar 9 at 10:35
answered Apr 14 '12 at 9:42
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How do I concatenate or merge arrays in Swift?
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You can concatenate the arrays with +, building a new array
let c = a + b
print(c) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
or append one array to the other with += (or append):
a += b
// Or:
a.append(contentsOf: b) // Swift 3
a.appendContentsOf(b) // Sw...
PyLint, PyChecker or PyFlakes? [closed]
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Well, I am a bit curious, so I just tested the 3 myself right after asking the question ;-)
Ok, this is not a very serious review but here is what I can say :
I tried the tools with the default settings (it's important because you can pr...
How do you run your own code alongside Tkinter's event loop?
My little brother is just getting into programming, and for his Science Fair project, he's doing a simulation of a flock of birds in the sky. He's gotten most of his code written, and it works nicely, but the birds need to move every moment .
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How do I check which version of NumPy I'm using?
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edited Apr 22 '16 at 14:21
David Stansby
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How can I force users to access my page over HTTPS instead of HTTP?
...o force to be accessed as an HTTPS page (PHP on Apache). How do I do this without making the whole directory require HTTPS? Or, if you submit a form to an HTTPS page from an HTTP page, does it send it by HTTPS instead of HTTP?
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How do I get logs/details of ansible-playbook module executions?
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edited Apr 3 '16 at 2:31
techraf
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