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quick random row selection in Postgres
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Check this link out for some different options.
http://www.depesz.com/index.php/2007/09/16/my-thoughts-on-getting-random-row/
Update: (A.Hatchkins)
The summary of the (very) long article is as follows.
The author lists four approaches:
1) ORDER BY random() LIMIT 1; -- slow
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Calling Python in Java?
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Jython: Python for the Java Platform - http://www.jython.org/index.html
You can easily call python functions from Java code with Jython. That is as long as your python code itself runs under jython, i.e. doesn't use some c-extensions that aren't supported.
If that work...
How should I use try-with-resources with JDBC?
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How do you call Connection::setAutoCommit? Such a call is not allowed within the try between the con = and ps =. When getting a Connection from a DataSource that may be backed with a connection pool, we cannot assume how autoCommit is set.
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What's the best way to make a d3.js visualisation layout responsive?
...ted using Google Chrome. What browsers are viewBox and preserveAspectRatio compatible with?
– Chris Withers
Oct 13 '12 at 20:18
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Android Studio 0.4 Duplicate files copied in APK META-INF/LICENSE.txt
After I have updated my Studio from 0.3.7 to 0.4.0, I can't compile my project. I found a solution on stackoverflow: Duplicate files copied (Android Studio 0.4.0)
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What is the maximum depth of the java call stack?
...It depends on the amount of virtual memory allocated to the stack.
http://www.odi.ch/weblog/posting.php?posting=411
You can tune this with the -Xss VM parameter or with the Thread(ThreadGroup, Runnable, String, long) constructor.
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Python, Matplotlib, subplot: How to set the axis range?
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As found in http://www.mofeel.net/582-comp-soft-sys-matlab/54166.aspx
pylab.ylim([0,1000])
Note: The command has to be executed after the plot!
share
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what is the best way to convert a json formatted key value pair to ruby hash with symbol as key?
... you can pass in the symbolize_names option. See here: http://flori.github.com/json/doc/index.html (look under parse)
eg:
>> s ="{\"akey\":\"one\",\"bkey\":\"two\"}"
>> JSON.parse(s,:symbolize_names => true)
=> {:akey=>"one", :bkey=>"two"}
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What is the difference between user and kernel modes in operating systems?
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Kernel Mode
In Kernel mode, the executing code has complete and unrestricted
access to the underlying hardware. It
can execute any CPU instruction and
reference any memory address. Kernel
mode is generally reserved for the
lowest-level, most trusted functions
of t...