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Is it possible to GROUP BY multiple columns using MySQL?
...garding SUM using with GROUP BY. If GROUP BY only by one column, then SUMs all values of each distinct (different) the column value sqlfiddle.com/#!9/1cbde2/2. If GROUP BY two columns. Then mysql at first checks if for the first column value there are different values in the second column. If yes, t...
How to replace plain URLs with links?
... a reference.
– oelna
Jun 10 '14 at 11:25
2
@DanDascalescu Take a look at this markdown-it.github...
Git: can't undo local changes (error: path … is unmerged)
...
It's always amusing when the highest voted answer basically just says "you're doing it wrong" :)
– nathanchere
Dec 16 '12 at 23:39
4
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Copy data into another table
...the column list for newTable is optional if you are specifying a value for all columns and selecting columns in the same order as newTable's schema):
INSERT INTO newTable (col1, col2, col3)
SELECT column1, column2, column3
FROM oldTable
...
How to load a xib file in a UIView
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To get an object from a xib file programatically you can use: [[NSBundle mainBundle] loadNibNamed:@"MyXibName" owner:self options:nil] which returns an array of the top level objects in the xib.
So, you could do something like this:
UIView *rootView = [[[NSBundle mai...
Where does gcc look for C and C++ header files?
...stem header.
If you run gcc in verbose mode on such a source, it will list all the system include locations as it looks for the bogus header.
$ echo "#include <bogus.h>" > t.c; gcc -v t.c; rm t.c
[..]
#include "..." search starts here:
#include <...> search starts here:
/usr/local...
How to get all Errors from ASP.Net MVC modelState?
I want to get all the error messages out of the modelState without knowing the key values. Looping through to grab all the error messages that the ModelState contains.
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How to check if a specific key is present in a hash or not?
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Bozhidar BatsovBozhidar Batsov
50.9k1111 gold badges9090 silver badges110110 bronze badges
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How to handle WndProc messages in WPF?
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Actually, as far as I understand such a thing is indeed possible in WPF using HwndSource and HwndSourceHook. See this thread on MSDN as an example. (Relevant code included below)
// 'this' is a Window
HwndSource source = HwndSou...
Peak-finding algorithm for Python/SciPy
...ant to understand well its parameters width, threshold, distance and above all prominence to get a good peak extraction.
According to my tests and the documentation, the concept of prominence is "the useful concept" to keep the good peaks, and discard the noisy peaks.
What is (topographic) promine...