大约有 47,000 项符合查询结果（耗时：0.0907秒） [XML]
Why does an overridden function in the derived class hide other overloads of the base class?
...
4 Answers
4
Active
...
How to truncate string using SQL server
i have large string in SQL Server. I want to truncate that string to 10 or 15 character
6 Answers
...
Difference between as.POSIXct/as.POSIXlt and strptime for converting character vectors to POSIXct/PO
I have followed a number of questions here that asks about how to convert character vectors to datetime classes. I often see 2 methods, the strptime and the as.POSIXct/as.POSIXlt methods. I looked at the 2 functions but am unclear what the difference is.
...
Rails: create on has_one association
Hi (huge Rails newbie here), I have the following models:
4 Answers
4
...
Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
...
React ignores 'for' attribute of the label element
In React (Facebook's framework), I need to render a label element bound to a text input using the standard for attribute.
...
What does the arrow operator, '->', do in Java?
While hunting through some code I came across the arrow operator, what exactly does it do? I thought Java did not have an arrow operator.
...
Git commit date
Other than parsing git log for the date string, is there a Git native way to report the date of a certain commit?
4 Answers...
how to create a file name with the current date & time in python?
Here is a functional code (Create file with success)
6 Answers
6
...
Multi-line commands in GHCi
I am having problem in entering multi-line commands in ghci.
5 Answers
5
...