大约有 16,380 项符合查询结果（耗时：0.0326秒） [XML]
How do I (or can I) SELECT DISTINCT on multiple columns?
I need to retrieve all rows from a table where 2 columns combined are all different. So I want all the sales that do not have any other sales that happened on the same day for the same price. The sales that are unique based on day and price will get updated to an active status.
...
What is the difference between single and double quotes in SQL?
...g in SQL. Double quotes generally aren't used in SQL, but that can vary from database to database.
Stick to using single quotes.
That's the primary use anyway. You can use single quotes for a column alias — where you want the column name you reference in your application code to be something ot...
I want to execute shell commands from Maven's pom.xml
I want to execute Linux shell commands with Maven. Here is what I tried:
5 Answers
5
...
Can I control the location of .NET user settings to avoid losing settings on application upgrade?
I'm trying to customize the location of the user.config file. Currently it's stored with a hash and version number
4 Ans...
Rails 4: List of available datatypes
...
Here are all the Rails 4 (ActiveRecord migration) datatypes:
:binary
:boolean
:date
:datetime
:decimal
:float
:integer
:bigint
:primary_key
:references
:string
:text
:time
:timestamp
Source: http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/Sc...
Why doesn't C# support the return of references?
...of references, but C# doesn't. Is there a special reason? Why I can't do something like:
4 Answers
...
Get MD5 hash of big files in Python
I have used hashlib (which replaces md5 in Python 2.6/3.0) and it worked fine if I opened a file and put its content in hashlib.md5() function.
...
UnicodeDecodeError when redirecting to file
I run this snippet twice, in the Ubuntu terminal (encoding set to utf-8), once with ./test.py and then with ./test.py >out.txt :
...
What's the difference between EscapeUriString and EscapeDataString?
...
Use EscapeDataString always (for more info about why, see Livven's answer below)
Edit: removed dead link to how the two differ on encoding
share
|
improve ...
In Windows Azure: What are web role, worker role and VM role?
The application I work on contains a web role: it's a simple web application. I needed to host the application in Windows Azure, so I created a web role. I actually want to know what these roles are for. What is their significance coding wise or storage wise?
...