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PostgreSQL query to return results as a comma separated list
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209
SELECT string_agg(id::text, ',') FROM table
Requires PostgreSQL 9.0 but that's not a problem.
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JS - get image width and height from the base64 code
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answered Jul 21 '13 at 18:06
gp.gp.
7,17833 gold badges3333 silver badges3636 bronze badges
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gulp globbing- how to watch everything below directory
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edited Nov 30 '16 at 10:24
FelipeAls
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What happens if you call erase() on a map element while iterating from begin to end?
... port_map.erase(pm_it);
}
else
{
++pm_it;
}
}
C++03
Erasing elements in a map does not invalidate any iterators.
(apart from iterators on the element that was deleted)
Actually inserting or deleting does not invalidate any of the iterators:
Also see this answer:
Mark Ran...
Python - abs vs fabs
...pe of its argument.
In [7]: type(abs(-2))
Out[7]: int
In [8]: type(abs(-2.0))
Out[8]: float
In [9]: type(abs(3+4j))
Out[9]: float
In [10]: type(math.fabs(-2))
Out[10]: float
In [11]: type(math.fabs(-2.0))
Out[11]: float
In [12]: type(math.fabs(3+4j))
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XML Document to String
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207
Assuming doc is your instance of org.w3c.dom.Document:
TransformerFactory tf = TransformerFact...
Tuning nginx worker_process to obtain 100k hits per min
...er_processes 4; # 2 * Number of CPUs
events {
worker_connections 19000; # It's the key to high performance - have a lot of connections available
}
worker_rlimit_nofile 20000; # Each connection needs a filehandle (or 2 if you are proxying)
# Total amount of users you can serve = worke...
How do I determine height and scrolling position of window in jQuery?
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answered Nov 19 '08 at 23:24
Pim JagerPim Jager
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What's the difference between dist-packages and site-packages?
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jterracejterrace
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How to Get the Title of a HTML Page Displayed in UIWebView?
...ut Swift 4?
– Jayprakash Dubey
Apr 10 '18 at 5:56
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