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Facebook database design?
...rID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
EmailAddress
Password
Gender
DOB
Location
TableName: Friends
Columns:
UserID PK FK...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail)postfix + dovecot + extmail解决方案搭建邮件服务器全攻略，以及搭建过程中常见问题的解决方法汇总。首先通过一幅图看看整个解决方案的原理：
当用户通过extmail登陆时，首先extm...
What does f+++++++++ mean in rsync logs?
I'm using rsync to make a backup of my server files, and I have two questions:
4 Answers
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Alphabet range in Python
Instead of making a list of alphabet characters like this:
7 Answers
7
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Why does base64 encoding require padding if the input length is not divisible by 3?
...the purpose of padding in base64 encoding. The following is the extract from wikipedia:
3 Answers
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How to use single storyboard uiviewcontroller for multiple subclass
...hich is connected to right navigation button of the navigation bar
From there I would like to use the storyboard as a template for other views without having to create additional storyboards. Say these views will have exactly the same interface but with root view controller of class SpecificVi...
When to use reinterpret_cast?
I am little confused with the applicability of reinterpret_cast vs static_cast . From what I have read the general rules are to use static cast when the types can be interpreted at compile time hence the word static . This is the cast the C++ compiler uses internally for implicit casts also.
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Some built-in to pad a list in python
...''] * (N - len(a))
you can always create a subclass of list and call the method whatever you please
class MyList(list):
def ljust(self, n, fillvalue=''):
return self + [fillvalue] * (n - len(self))
a = MyList(['1'])
b = a.ljust(5, '')
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What is the difference between a HashMap and a TreeMap? [duplicate]
I started learning Java. When would I use a HashMap over a TreeMap?
8 Answers
8
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What is “rvalue reference for *this”?
Came across a proposal called "rvalue reference for *this" in clang's C++11 status page .
3 Answers
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