大约有 44,000 项符合查询结果（耗时：0.0476秒） [XML]
CASCADE DELETE just once
I have a Postgresql database on which I want to do a few cascading deletes. However, the tables aren't set up with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to
...
Add column with number of days between dates in DataFrame pandas
I want to subtract dates in 'A' from dates in 'B' and add a new column with the difference.
4 Answers
...
How do I use itertools.groupby()?
I haven't been able to find an understandable explanation of how to actually use Python's itertools.groupby() function. What I'm trying to do is this:
...
Convert absolute path into relative path given a current directory using Bash
Example:
23 Answers
23
...
map function for objects (instead of arrays)
I have an object:
38 Answers
38
...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
While there are multiple ways to reverse bit order in a byte, I'm curious as to what is the "simplest" for a developer to implement. And by reversing I mean:
...
How to convert list of key-value tuples into dictionary?
I have a list that looks like:
7 Answers
7
...
How might I find the largest number contained in a JavaScript array?
I have a simple JavaScript Array object containing a few numbers.
28 Answers
28
...
Difference between git checkout --track origin/branch and git checkout -b branch origin/branch
Does anybody know the difference between these two commands to switch and track a remote branch?
4 Answers
...