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SELECT DISTINCT on one column
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329
Assuming that you're on SQL Server 2005 or greater, you can use a CTE with ROW_NUMBER():
SELE...
Upgrade python in a virtualenv
... you may have some problems if you change from python 2.6 to 2.7 or 2.7 to 3.x but if you just upgrade inside the same version (staying at 2.7 as you want) you shouldn't have any problem, as all the packages are held in the same folders for both python versions (2.7.x and 2.7.y packages are inside y...
Difference between char* and const char*?
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edited Feb 28 '18 at 23:51
Lawrence Dol
57.6k2525 gold badges129129 silver badges179179 bronze badges
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How are multi-dimensional arrays formatted in memory?
...eter, bad things are going to happen. Here's a quick example:
int array1[3][2] = {{0, 1}, {2, 3}, {4, 5}};
In memory looks like this:
0 1 2 3 4 5
exactly the same as:
int array2[6] = { 0, 1, 2, 3, 4, 5 };
But if you try to pass array1 to this function:
void function1(int **a);
you'll ge...
In c# is there a method to find the max of 3 numbers?
Like Math.Max but takes 3 or params of int?
10 Answers
10
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Convert base64 string to ArrayBuffer
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edited Oct 30 '19 at 11:00
Massimiliano Kraus
3,06344 gold badges1919 silver badges3636 bronze badges
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python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B
...]: df.drop_duplicates(subset='A', keep="last")
Out[10]:
A B
1 1 20
3 2 40
4 3 10
You can do also something like:
In [12]: df.groupby('A', group_keys=False).apply(lambda x: x.loc[x.B.idxmax()])
Out[12]:
A B
A
1 1 20
2 2 40
3 3 10
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vim deleting backward tricks
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answered Sep 3 '09 at 15:01
Lucas OmanLucas Oman
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How can we run a test method with multiple parameters in MSTest?
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edited Jul 28 at 21:13
Peter Mortensen
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What is the purpose of the reader monad?
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3 Answers
3
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