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How can you represent inheritance in a database?
...'m thinking about how to represent a complex structure in a SQL Server database.
8 Answers
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View the change history of a file using Git versioning
...
If you prefer to stay text-based, you may want to use tig.
Quick Install:
apt-get: # apt-get install tig
Homebrew (OS X): $ brew install tig
Use it to view history on a single file: tig [filename]
Or browse detailed repo history: tig
Similar to...
WPF vs Silverlight [duplicate]
...form that has access to the full .Net Framework. Silverlight is a browser-based technology that has access to a subset of the .Net Framework (called the CoreCLR). So, you'll notice differences using seemingly every day methods and objects within the framework. For instance, the Split() method on ...
Why JavaScript rather than a standard browser virtual machine?
...y aspects of server-side languages. JavaScript is just fine as a prototype-based language, without being full-blown object oriented.
If there is a lack of seamlessness to your applications because the server-side and client-side are not communicating well, then you might want to reconsider how you ...
Difference between is and as keyword
...sages of both the keywords, you will get the difference easily.
C# Code:
BaseClass baseclassInstance = new DerivedClass();
DerivedClass derivedclassInstance;
if (baseclassInstance is DerivedClass)
{
derivedclassInstance = (DerivedClass)baseclassInstance;
// do something on derivedclassInsta...
git rebase, keeping track of 'local' and 'remote'
When doing a git rebase, I often have difficulty working out what is happening with the 'local' and 'remote' when resolving conflicts. I sometimes have the impression that they swap sides from one commit to the next.
...
What exactly does stringstream do?
...um, unsigned int prec = 12) {
string ret;
stringstream ss;
ios_base::fmtflags ff = ss.flags();
ff |= ios_base::floatfield;
ff |= ios_base::fixed;
ss.flags(ff);
ss.precision(prec);
ss << num;
ret = ss.str();
return ret;
};
Maybe it's a bit complicated b...
Difference between Destroy and Delete
... API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can't be persisted). Returns the frozen instance.
The row is simply removed with an SQL DELETE statement on the record's primary key, a...
Docker - how can I copy a file from an image to a host?
...
docker cp $(docker create --rm registry.example.com/ansible-base:latest):/home/ansible/.ssh/id_rsa ./hacked_ssh_key
wanted to supply a one line solution based on pure docker functionality (no bash needed)
edit: container does not even has to be run in this solution
edit2: thanks to @...
What is the purpose of setting a key in data.table?
...antage to keying a data.table?
Keying a data.table physically reorders it based on those column(s) in RAM. Computing the order is not usually the time consuming part, rather the reordering itself. However, once we've the data sorted in RAM, the rows belonging to the same group are all contiguous in...