大约有 32,000 项符合查询结果（耗时：0.0511秒） [XML]
What is the PostgreSQL equivalent for ISNULL()
...
SELECT CASE WHEN field IS NULL THEN 'Empty' ELSE field END AS field_alias
Or more idiomatic:
SELECT coalesce(field, 'Empty') AS field_alias
share
|
im...
Get time difference between two dates in seconds
...xplanation
You need to call the getTime() method for the Date objects, and then simply subtract them and divide by 1000 (since it's originally in milliseconds). As an extra, when you're calling the getDate() method, you're in fact getting the day of the month as an integer between 1 and 31 (not zero...
Advantages of using display:inline-block vs float:left in CSS
...e used in extreme circumstances, like font-size:0; on the column container then reapply font size within each column.
For example:
Here's a 3-column grid of 33.3% width with float: left. It "just works" (but for the wrapper needing to be cleared).
Here's the exact same grid, with inline-block. T...
How does functools partial do what it does?
... 21
but this will throw (e.g., creating partial with keyword argument then calling using positional arguments)
>>> pfnx = partial(fnx, a=12)
>>> pfnx(4, 5)
Traceback (most recent call last):
File "<pyshell#80>", line 1, in <module>
pfnx(4, 5)
...
How to change navbar collapse threshold using Twitter bootstrap-responsive?
...esponsive.css is buried in the bootstrap-sass gem. Yes I could edit it but then when the gem is updated, I'd have to do it again. Is there a way to override the @media query, similar to overriding other CSS elements?
– Mark Berry
Feb 23 '12 at 1:53
...
JSON datetime between Python and JavaScript
... else:
return super(DateTimeJSONEncoder, self).default(obj)
Then, you can call it like this:
>>> DateTimeJSONEncoder().encode([datetime.datetime.now()])
'["2010-06-15T14:42:28"]'
share
|
...
HTML/Javascript change div content
...
Get the id of the div whose content you want to change then assign the text as below:
var myDiv = document.getElementById("divId");
myDiv.innerHTML = "Content To Show";
share
|
...
No appenders could be found for logger(log4j)?
...e to the Classpath in Eclipse.
Make sure your project is open in Eclipse, then click on the "Run" menu at the top of Eclipse and click on the following:
Run
Run Configurations
Classpath (tab)
User Entries
Advanced (button on the right)
Add Folders
then navigate to the folder that contains your lo...
Unique (non-repeating) random numbers in O(1)?
...
If each insert into the shuffled array is an operation, then after inserting 1 value, you can get 1 random value. 2 for 2 values, and so on, n for n values. It takes n operations to generate the list, so the entire algorithm is O(n). If you need 1,000,000 random values, it will...
Is an entity body allowed for an HTTP DELETE request?
... the request method does not include defined semantics for an entity-body, then the message-body SHOULD be ignored when handling the request."
– shelley
Jan 9 '13 at 23:49
...