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Retrieving the last record in each group - MySQL
...TH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer I wrote for this question in 2009:
I write the solution this way:
SELECT m1.*
FROM messages m1 LEFT...
ASP.NET Web Site or ASP.NET Web Application?
.... It will compile the application into a single DLL file at build
time. In order to update the project, it must be recompiled and the DLL file
published for changes to occur.
Another nice feature of the Web Application
project is it's much easier to exclude files from the project view. In the
Web ...
Object of custom type as dictionary key
...ride __hash__ if you want special hash-semantics, and __cmp__ or __eq__ in order to make your class usable as a key. Objects who compare equal need to have the same hash value.
Python expects __hash__ to return an integer, returning Banana() is not recommended :)
User defined classes have __hash_...
“Code too large” compilation error in Java
...rogram's source code without modifying its external functional behavior in order to improve some of the nonfunctional attributes of the software." How are other answers different from this?
– Padmarag
Mar 10 '10 at 5:34
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Inserting a Link to a Webpage in an IPython Notebook
...ything worked. theukwebdesigncompany.com/articles/entity-escape-characters.php
– Afflatus
Feb 13 '17 at 15:42
2
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How do I create an average from a Ruby array?
...
Some benchmarking of top solutions (in order of most efficient):
Large Array:
array = (1..10_000_000).to_a
Benchmark.bm do |bm|
bm.report { array.instance_eval { reduce(:+) / size.to_f } }
bm.report { array.sum.fdiv(array.size) }
bm.report { array.sum / a...
Dynamically set local variable [duplicate]
...y I was just bitter about all the data stores being replicated or moved in order to handle callback delegates, etc.
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What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
...ave access to all of the parent scope properties.
See also Controller load order differs when loading or navigating)
directives
default (scope: false) - the directive does not create a new scope, so there is no inheritance here. This is easy, but also dangerous because, e.g., a directive might t...
What is this 'Lambda' everyone keeps speaking of?
...
The above abstraction may not be that useful, but there are other higher order functions, like forEach, that perform much more useful tasks. For example filter:
var numbers = [1, 2, 3, 4];
var even = [];
// keep all even numbers from above array
for (var i=0; i<numbers.length; i++) {
i...
Get object by id()? [duplicate]
...
repr outputs the hexadecimal representation of id(a), in order to use ctypes one must convert it back to decimal by using int(hexid, 0). just my two cents here
– architectonic
Mar 18 '16 at 9:07
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