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How to get first character of a string in SQL?
...ver may be able to optimise LEFT better than SUBSTRING when it is using an index.
– thomasrutter
Apr 27 '09 at 5:26
20
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Mongo: find items that don't have a certain field
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Be warned, $exist queries cannot use indexes (see mongodb.org/display/DOCS/…).
– Theo
Apr 19 '11 at 17:03
4
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What is the difference between the Eclipse Package Explorer and the Eclipse Project Explorer?
It seems to me these two views are virtually identical, especially since Galileo. Is this true, or am I missing out on some features of one or the other?
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How to send password securely over HTTP?
...alid complaint, since you can get them for $30 these days. Is your data really not worth 30 bucks to protect?
– caf
Oct 18 '09 at 2:08
3
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Compile error: “g++: error trying to exec 'cc1plus': execvp: No such file or directory”
When I compile C/C++ program with popen in php ... I got this error:
9 Answers
9
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Skip the headers when editing a csv file using Python
...ictReader class, which "skips" the header row and uses it to allowed named indexing.
Given "foo.csv" as follows:
FirstColumn,SecondColumn
asdf,1234
qwer,5678
Use DictReader like this:
import csv
with open('foo.csv') as f:
reader = csv.DictReader(f, delimiter=',')
for row in reader:
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Meaning of tilde in Linux bash (not home directory)
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Tilde expansion in Bash:
http://bash-hackers.org/wiki/doku.php/syntax/expansion/tilde
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Resolve absolute path from relative path and/or file name
...e current working directory, which is obviously not what you want.
Personally, I often use the %~dp0%~1 idiom in my batch file, which interpret the first argument relative to the path of the executing batch. It does have a shortcoming though: it miserably fails if the first argument is fully-quali...
Most efficient way to store thousand telephone numbers
...very efficient version of trie, that only uses as little as needed for the indexing and only two levels. In practice it would be nice to see if this can beat a trie with more levels, but I think this depends a lot on the distribution of the numbers (In real live phone numbers are not fully random, b...
How to iterate object in JavaScript? [duplicate]
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for(index in dictionary) {
for(var index in dictionary[]){
// do something
}
}
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