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How can I convert immutable.Map to mutable.Map in Scala?
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128
The cleanest way would be to use the mutable.Map varargs factory. Unlike the ++ approach, thi...
Get top 1 row of each group
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771
;WITH cte AS
(
SELECT *,
ROW_NUMBER() OVER (PARTITION BY DocumentID ORDER BY DateCre...
Is there a way to loop through a table variable in TSQL without using a cursor?
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
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190
There are many ways to do this. This answer starts with what is quickly becoming the standard...
How do I get the last character of a string?
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css transform, jagged edges in chrome
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What does SQL clause “GROUP BY 1” mean?
...QL query where the GROUP BY clause consisted of the statement: GROUP BY 1 .
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Pandas dataframe get first row of each group
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>>> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 second
5 first
6 first
7 fourth
If you need id as column:
>>> df.groupby('id').first().reset_index()
id value
0 1 first
1 2 first
2 3 first
3 4 seco...
Check if a file exists with wildcard in shell script [duplicate]
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