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Get records with max value for each group of grouped SQL results
... and also the problems of returning multiple rows when there are more than one with the same maximum value (as the other answers would do)
Note: This is a mysql-only solution. All other databases I know will throw an SQL syntax error with the message "non aggregated columns are not listed in the gro...
Best way to strip punctuation from a string
...
From an efficiency perspective, you're not going to beat
s.translate(None, string.punctuation)
For higher versions of Python use the following code:
s.translate(str.maketrans('', '', string.punctuation))
It's performing raw string operations in C with a lookup table - there's not much that...
find: missing argument to -exec
... - $2 - $3
$ find /tmp/foo -exec /tmp/echoargs {} \;
/tmp/foo - -
/tmp/foo/one - -
/tmp/foo/two - -
$ find /tmp/foo -exec /tmp/echoargs {} +
/tmp/foo - /tmp/foo/one - /tmp/foo/two
Your command has two errors:
First, you use {};, but the ; must be a parameter of its own.
Second, the command ends ...
Function overloading by return type?
... to what others are saying, overloading by return type is possible and is done by some modern languages. The usual objection is that in code like
int func();
string func();
int main() { func(); }
you can't tell which func() is being called. This can be resolved in a few ways:
Have a predictab...
How do you detect where two line segments intersect? [closed]
...imilarly a vector parallel to the z axis. So... do I just divide the z component by the other z component? Is the formula for t actually |(q − p) × s| / |(r × s)|?
– LarsH
Aug 31 '12 at 3:40
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How to update only one field using Entity Framework?
...u are updating: if (db.Entry(user).Property(x => x.Password).GetValidationErrors().Count == 0)
– Ziul
Aug 27 '15 at 23:28
2
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How can we match a^n b^n with Java regex?
One of the archetypal non- regular languages is:
3 Answers
3
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How to use multiple AWS Accounts from the command line?
I've got two different apps that I am hosting (well the second one is about to go up) on Amazon EC2.
7 Answers
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Find the index of a dict within a list, by matching the dict's value
...ex = next((index for (index, d) in enumerate(lst) if d["name"] == "Tom"), None)
# 1
If you need to fetch repeatedly from name, you should index them by name (using a dictionary), this way get operations would be O(1) time. An idea:
def build_dict(seq, key):
return dict((d[key], dict(d, index=...
Is async HttpClient from .Net 4.5 a bad choice for intensive load applications?
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Besides the tests mentioned in the question, I recently created some new ones involving much fewer HTTP calls (5000 compared to 1 million previously) but on requests that took much longer to execute (500 milliseconds compared to around 1 millisecon...