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Using group by on multiple columns
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I would like to add that the order in which you group by the columns does not matter. In the above example group by Semester, Subject would have given the same result
– user2441441
Sep 29 '15 at 21:07
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Preferred order of writing latitude & longitude tuples in GIS services
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EPSG:4326 specifically states that the coordinate order should be latitude, longitude. Many software packages still use longitude, latitude ordering. This situation has wreaked unimaginable havoc on project deadlines and programmer sanity.
The best guidance one can offer is...
Interfaces — What's the point?
...zza type. Any instance whose type inherits from IPizza is guaranteed to be orderable, as it has an Order() method.
Python is not statically-typed, therefore types are kept and looked up at runtime. So you can try calling an Order() method on any object. The runtime is happy as long as the object ha...
What's wrong with using $_REQUEST[]?
...roduce.
You can change this behaviour to the much more sensible GP (no C) order with the request_order config in PHP 5.3. Where this is not possible, I personally would avoid $_REQUEST and, if I needed a combined GET+POST array, create it manually.
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Elements order in a “for (… in …)” loop
... "for…in" loop in Javascript loop through the hashtables/elements in the order they are declared? Is there a browser which doesn't do it in order?
The object I wish to use will be declared once and will never be modified.
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What is the difference between bottom-up and top-down?
...nces: {Web: 1,2} {Literature: 5}
Recap
Dynamic programming is all about ordering your computations in a way that avoids recalculating duplicate work. You have a main problem (the root of your tree of subproblems), and subproblems (subtrees). The subproblems typically repeat and overlap.
For exam...
When should I use cross apply over inner join?
...ELECT TOP 3 *
FROM t2
WHERE t2.t1_id = t1.id
ORDER BY
t2.rank DESC
) t2o
It cannot be easily formulated with an INNER JOIN condition.
You could probably do something like that using CTE's and window function:
WITH t2o AS
(
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Real world use cases of bitwise operators [closed]
...UIs used to rely on this for selection highlighting and other overlays, in order to eliminate the need for costly redraws. They're still useful in slow graphics protocols (i.e. remote desktop).
Those were just the first few examples I came up with - this is hardly an exhaustive list.
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What Computer Science concepts should I know? [closed]
...s, but find wikipedia too academic :D
Anyway, here goes, in no particular order:
The relational model: Introduction to Database systems
Object orientation : Object Thinking
Complexity and computation theory (think Turing machines and automata): Introduction to theory of computation
A little compi...
Python subprocess.Popen “OSError: [Errno 12] Cannot allocate memory”
...ve, from within your container, over swap and overcommit configuration (in order to influence the outcome of the enforcement.)
Now, in order to actually move forward I'd say you're left with two options:
switch to a larger instance, or
put some coding effort into more effectively controlling your...