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Quickly reading very large tables as dataframes
I have very large tables (30 million rows) that I would like to load as a dataframes in R. read.table() has a lot of convenient features, but it seems like there is a lot of logic in the implementation that would slow things down. In my case, I am assuming I know the types of the columns ahead o...
SQL Server 2008: How to query all databases sizes?
...
223
with fs
as
(
select database_id, type, size * 8.0 / 1024 size
from sys.master_files
)
se...
How do you merge two Git repositories?
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Simon PerepelitsaSimon Perepelitsa
18.8k88 gold badges5252 silver badges7272 bronze badges
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How to find if a given key exists in a C++ std::map
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edited Aug 28 '13 at 9:05
answered Dec 21 '09 at 12:58
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Fastest way to check if a file exist using standard C++/C++11/C?
... return ( access( name.c_str(), F_OK ) != -1 );
}
inline bool exists_test3 (const std::string& name) {
struct stat buffer;
return (stat (name.c_str(), &buffer) == 0);
}
Results for total time to run the 100,000 calls averaged over 5 runs,
Method exists_test0 (ifstream): **0.485s...
How to get the second column from command output?
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answered Apr 21 '13 at 22:57
cataycatay
33822 silver badges22 bronze badges
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How to force push a reset to remote repository?
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edited Dec 1 '17 at 13:21
community wiki
4...
Push existing project into Github
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346
git init
git add .
git commit -m "Initial commit"
git remote add origin <project url>
gi...
Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
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893
I hope it's not a "suicide note", but I can see your point. You hit on what is at the same time ...
REST API - why use PUT DELETE POST GET?
...mented as:
Post: /cars/oldest?action=delete
Whereas
Delete: /cars/id/123456
will result in the same server state if you call it once, or if you call it 1000 times.
A better way of handling the removal of the oldest item would be to request:
Get: /cars/oldest
and use the ID from the resulti...