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Change one value based on another value in pandas
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What is the most efficient/elegant way to parse a flat table into a tree?
...e tree_id column allows you to restart the lft and rght numbering for each top-level node, which reduces the number of columns affected by inserts, moves and deletions, as the lft and rght columns have to be adjusted accordingly when these operations take place in order to create or close gaps. I ma...
How important is the order of columns in indexes?
...e1 (MostSelective, SecondMost, Least)
output inserted.* into Table2
SELECT TOP 26 REPLICATE(CHAR(number + 65),800), number/5, '~'
FROM master..spt_values
WHERE type = 'P' AND number >= 0
ORDER BY number;
Now doing a query against both of the tables...
SELECT *
FROM Table1
WHERE MostSelectiv...
How do I make a Git commit in the past?
...om the first commit, add your new commit, then rebase all other commits on top of the new one. Like so:
$ git checkout -b new_commit $desired_parent_of_new_commit
$ git add new_file
$ GIT_AUTHOR_DATE='your date' GIT_COMMITTER_DATE='your date' git commit -m 'new (old) files'
$ git checkout master
$ ...
How do you track record relations in NoSQL?
... relational data modeling, or you do a bunch of analysis up front for your top-priority queries, or you do a bunch of costly refactoring throughout the project as you discover which parts of your design didn't get enough analysis up front.
– Bill Karwin
Nov 20 ...
Why is “except: pass” a bad programming practice?
... something of application-level importance, so it should be handled at the top—so let the exception bubble up.
Another simple example is also mentioned in the Python 2 idioms document. Here, a simple typo exists in the code which causes it to break. Because we are catching every exception, we als...
How exactly does CMake work?
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What XML parser should I use in C++? [closed]
...ore iterator-friendly API, and even an XPath 1.0 implementation layered on top of it.
TinyXML uses the zLib license, which is more or less the MIT License with a different name.
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DateTime vs DateTimeOffset
...ous timeline from different angles. Some of them are right next to (or on top of) each other, so just knowing the offset isn't enough to determine which timezone the time is related to.
And what about UTC? Well, it's the one camera out there that is guaranteed to have a steady hand. It's on a tr...
What is Cache-Control: private?
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