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postgresql - sql - count of `true` values
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You can actually omit ELSE null to get the same result.
– 200_success
May 12 '16 at 18:26
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各编程语言读写文件汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
各编程语言读写文件汇总all_programming_language_file_read_write_summary读写文件本来是非常基础的代码，但工作学习中难免会有遗忘，有时又难以翻看自己写过的代码，网上搜索更是五花八门让人头大，鉴于此，清泛网 读写文件本来是...
Flat file databases [closed]
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Well, what is the nature of the flat databases. Are they large or small. Is it simple arrays with arrays in them? if its something simple say userprofiles built as such:
$user = array("name" => "dubayou",
"age" => 20,
"websites" => array("dubayou.com",...
String's Maximum length in Java - calling length() method
...he maximum length that would be returned by the method would be Integer.MAX_VALUE, which is 2^31 - 1 (or approximately 2 billion.)
In terms of lengths and indexing of arrays, (such as char[], which is probably the way the internal data representation is implemented for Strings), Chapter 10: Arrays ...
PostgreSQL error 'Could not connect to server: No such file or directory'
...u are on OS X
Here is the fix:
Stop the database
cd /var
sudo rm -r pgsql_socket
sudo ln -s /tmp pgsql_socket
chown _postgres:_postgres pgsql_socket
Restart PostgreSQL (not your computer)
More information is available at "postgresql 9.0.3. on Lion Dev Preview 1".
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How do I get the localhost name in PowerShell?
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Don't forget that all your old console utilities work just fine in PowerShell:
PS> hostname
KEITH1
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Can I “multiply” a string (in C#)?
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I don't think it's elegant at all. In python the code to do this is: snip * multiplier (It's not horrible.. but neither is it beautiful).
– demented hedgehog
Jun 2 '15 at 2:56
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test if event handler is bound to an element in jQuery [duplicate]
...a('events') has been removed in jQuery 1.8. For "debugging, you can use $._data(element, 'events'), but it's undocumented (and may change). blog.jquery.com/2012/08/09/jquery-1-8-released
– Rocket Hazmat
Aug 16 '12 at 18:43
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Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
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Consider the code below.
def return_something(someint):
if someint > 5:
return someint
y = return_something(2)
y.real()
This is going to give you the error
AttributeError: 'NoneType' object has no attribute 'real'
So points are as below.
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How do I get jQuery to select elements with a . (period) in their ID?
... For that reason, in CSS itself, you must escape a dot in an ID, too. All jQuery is doing is requiring you to follow the rules set out by CSS.
– bdukes
Apr 6 '09 at 14:11
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