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Cannot truncate table because it is being referenced by a FOREIGN KEY constraint?
... cannot check to see whether the records in the table are being referenced by a record in the child table.
This is why DELETE works and TRUNCATE TABLE doesn't: because the database is able to make sure that it isn't being referenced by another record.
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Difference between >>> and >>
...d appreciate that arithmetic shifts can be used to multiply signed numbers by 2^k, I find it weird that this is everyone's answer. A string of bits isn't a number, and >> can always be used on any string of bits: it always does the same thing regardless of the role that string of bits is playi...
Why can lambdas be better optimized by the compiler than plain functions?
...ond Edition) Nicolai Josuttis states that lambdas can be better optimized by the compiler than plain functions.
2 Answers
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How to Sort a List by a property in the object
...think of is to use Linq:
List<Order> SortedList = objListOrder.OrderBy(o=>o.OrderDate).ToList();
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cocktail party algorithm SVD implementation … in one line of code?
In a slide within the introductory lecture on machine learning by Stanford's Andrew Ng at Coursera, he gives the following one line Octave solution to the cocktail party problem given the audio sources are recorded by two spatially separated microphones:
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One DbContext per web request… why?
...uch as
LINQ to SQL's DataContext, and NHibernate's ISession.
Let start by echoing Ian: Having a single DbContext for the whole application is a Bad Idea. The only situation where this makes sense is when you have a single-threaded application and a database that is solely used by that single app...
Vagrant ssh authentication failure
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For general information: by default to ssh-connect you may simply use
user: vagrant password: vagrant
https://www.vagrantup.com/docs/boxes/base.html#quot-vagrant-quot-user
First, try: to see what vagrant insecure_private_key is in your machine con...
How to detect a loop in a linked list?
...references to the list and move them at different speeds. Move one forward by 1 node and the other by 2 nodes.
If the linked list has a loop they
will definitely meet.
Else either of
the two references(or their next)
will become null.
Java function implementing the algorithm:
boolean hasLoop(N...
What is the easiest way to remove all packages installed by pip?
...e requirements.txt).
pip freeze > requirements.txt
Now to remove one by one
pip uninstall -r requirements.txt
If we want to remove all at once then
pip uninstall -r requirements.txt -y
If you're working on an existing project that has a requirements.txt file and your environment has div...
Unit testing void methods?
...ually took place. e.g.
void DeductFromBalance( dAmount )
can be tested by verifying if the balance post this message is indeed less than the initial value by dAmount
Informational methods - are rare as a member of the public interface of the object... hence not normally unit-tested. However if ...