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Grouped LIMIT in PostgreSQL: show the first N rows for each group?
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New solution (PostgreSQL 8.4)
SELECT
*
FROM (
SELECT
ROW_NUMBER() OVER (PARTITION BY section_id ORDER BY name) AS r,
t.*
FROM
xxx t) x
WHERE
x.r <= 2;
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Observer Design Pattern vs “Listeners”
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Derek GreerDerek Greer
12.4k55 gold badges3535 silver badges4545 bronze badges
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How to check if a variable exists in a FreeMarker template?
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darckcrystale
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answered Nov 20 '08 at 20:25
Ulf LindbackUlf Lindback
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How to use base class's constructors and assignment operator in C++?
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answered Aug 4 '09 at 11:32
MottiMotti
95.3k4242 gold badges176176 silver badges242242 bronze badges
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Get column index from column name in python pandas
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Sure, you can use .get_loc():
In [45]: df = DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
In [46]: df.columns
Out[46]: Index([apple, orange, pear], dtype=object)
In [47]: df.columns.get_loc("pear")
Out[47]: 2
although to be honest I do...
Why does the C++ map type argument require an empty constructor when using []?
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baydabayda
12.1k77 gold badges3434 silver badges4848 bronze badges
11
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How to download/checkout a project from Google Code in Windows?
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Tom ChantlerTom Chantler
13.9k44 gold badges4141 silver badges5050 bronze badges
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How do I download a tarball from GitHub using cURL?
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148
Use the -L option to follow redirects:
curl -L https://github.com/pinard/Pymacs/tarball/v0.24-...
“icon-bar” in twitter bootstrap navigation bar
...dited Mar 28 '18 at 21:18
user664833
15k1818 gold badges7777 silver badges120120 bronze badges
answered Sep 18 '13 at 6:02
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