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What is a proper naming convention for MySQL FKs?
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In MySQL, there is no need to give a symbolic name to foreign key constraints. If a name is not given, InnoDB creates a unique name automatically.
In any case, this is the convention that I use:
fk_[referencing table name]_[referenced table name]_[referencing field name]
Exa...
How to specify different Debug/Release output directories in QMake .pro file
...o file to behave: it simply starts qmake and then make in the build folder for your target's chosen configuration.
If you wish to create these folders and perform the two (or more) builds in them, you'll need a top-level makefile, possibly created from a top-level project file via qmake.
It's not ...
What are type lambdas in Scala and what are their benefits?
...g with higher-kinded types.
Consider a simple example of defining a monad for the right projection of Either[A, B]. The monad typeclass looks like this:
trait Monad[M[_]] {
def point[A](a: A): M[A]
def bind[A, B](m: M[A])(f: A => M[B]): M[B]
}
Now, Either is a type constructor of two argu...
Understanding slice notation
...d
Python is kind to the programmer if there are fewer items than you ask for. For example, if you ask for a[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen.
Relation to slice() obje...
Rank function in MySQL
...k of customers. Here I am adding the corresponding ANSI standard SQL query for my requirement. Please help me to convert it to MySQL .
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“ImportError: No module named” when trying to run Python script
...does (be it an IPython notebook, external process, etc). IPython will look for modules to import that are not only found in your sys.path, but also on your current working directory. When starting an interpreter from the command line, the current directory you're operating in is the same one you sta...
CoInitialize浅析一 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... push [ebp+8] ; pvReserved
769B2A2E call _CoInitializeEx@8 ; CoInitializeEx(x,x)
769B2A33 pop ebp
769B2A34 retn 4
可以看到，其中的实现还是比较简单的，它只是简单地调用了CoInitializeEx，将第二个...
Regex to validate password strength
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For anyone who wants a length of at least n, replace .{8} with .{n,}
– NullUserException
Oct 15 '12 at 16:33
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How do I concatenate or merge arrays in Swift?
...elligence extends to determining whether the b part of a is modified (therefore possibly eliding a copy of b during a.appendContentsOf(b))?
– Ephemera
Sep 20 '15 at 7:34
1
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Check if OneToOneField is None in Django
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Thank you for this solution. Unfortunately, this doesn't work all the time. In case you want to work with select_related() now or in the future -- or maybe even to be sure you also handle other sorts of magic which may happen elsewhere...