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Simplest way to do a recursive self-join?
...e ultimate ancestors in your chain, change it as appropriate
UNION ALL
SELECT m.*
FROM mytable m
JOIN q
ON m.parentID = q.PersonID
)
SELECT *
FROM q
By adding the ordering condition, you can preserve the tree order:
WITH q AS
...
How can I select every other line with multiple cursors in Sublime Text?
...t already enabled, enable them: Alt+R
Type in the expression .*\n.*\n
Find all: Alt+Enter
Press left arrow to get rid of the selections, leaving just the cursors: ←
You now have a cursor at the start of every odd-numbered line. If you wanted even-numbered lines, press down: ↓
Depending on the fi...
Find all packages installed with easy_install/pip?
Is there a way to find all Python PyPI packages that were installed with easy_install or pip? I mean, excluding everything that was/is installed with the distributions tools (in this case apt-get on Debian).
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Python logging not outputting anything
...
@Ben where does it say that? All I can see is "The default level is WARNING, which means that only events of this level and above will be tracked, unless the logging package is configured to do otherwise."
– Omri Barel
...
Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll
...you use @BeforeClass when multiple tests need to share the same computationally expensive setup code. Establishing a database connection falls into this category. You can move code from @BeforeClass into @Before, but your test run may take longer. Note that the code marked @BeforeClass is run as sta...
Get current value of a setting in Vim
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If you don't remember what setting you want to check, you can view all settings:
:set all
or show each setting, one setting per line:
:set! all
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How Python web frameworks, WSGI and CGI fit together
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How WSGI, CGI, and the frameworks are all connected?
Apache listens on port 80. It gets an HTTP request. It parses the request to find a way to respond. Apache has a LOT of choices for responding. One way to respond is to use CGI to run a script. Another w...
How do I set up DNS for an apex domain (no www) pointing to a Heroku app?
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(Note: root, base, apex domains are all the same thing. Using interchangeably for google-foo.)
Traditionally, to point your apex domain you'd use an A record pointing to your server's IP. This solution doesn't scale and isn't viable for a cloud platform like H...
In C#, can a class inherit from another class and an interface?
...develop a generic component/interface that I can use to write programs for all our devices that will help keep the common things (like connecting, disconnecting, getting firmware) the same for all of our applications.
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Does git return specific return error codes?
...it, it returns non-zero - it doesn't explicitly say what is returned if it all works or if there was a merge conflict.
– Matt Curtis
Feb 7 '11 at 4:12
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