大约有 16,000 项符合查询结果（耗时：0.0423秒） [XML]
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
... am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 Ans...
What is an Android PendingIntent?
I am a newbie to Android. I read the Android Documentation but I still need some more clarification. Can anyone tell me what exactly a PendingIntent is?
...
Understanding colors on Android (six characters)
...ing to understand how colors work in Android. I have this color set as the background of my LinearLayout , and I get a background gray with some transparency:
...
Fastest way to check if a value exists in a list
...a
Clearest and fastest way to do it.
You can also consider using a set, but constructing that set from your list may take more time than faster membership testing will save. The only way to be certain is to benchmark well. (this also depends on what operations you require)
...
Convert absolute path into relative path given a current directory using Bash
...elative-to="$file1" "$file2"
For example:
$ realpath --relative-to=/usr/bin/nmap /tmp/testing
../../../tmp/testing
share
|
improve this answer
|
follow
|
...
Fast permutation -> number -> permutation mapping algorithms
...'s say, 7 elements, 1234567. I know there are 7! = 5040 permutations possible of these 7 elements.
12 Answers
...
Can Python test the membership of multiple values in a list?
I want to test if two or more values have membership on a list, but I'm getting an unexpected result:
10 Answers
...
Test whether a glob has any matches in bash
...
Bash specific solution:
compgen -G "<glob-pattern>"
Escape the pattern or it'll get pre-expanded into matches.
Exit status is:
1 for no-match,
0 for 'one or more matches'
stdout is a list of files matching t...
First-time database design: am I overengineering? [closed]
I'm a first year CS student and I work part time for my dad's small business. I don't have any experience in real world application development. I have written scripts in Python, some coursework in C, but nothing like this.
...
What does the keyword Set actually do in VBA?
Hopefully an easy question, but I'd quite like a technical answer to this!
7 Answers
7...