大约有 43,100 项符合查询结果（耗时：0.0473秒） [XML]
How do I sort one vector based on values of another
...
|
edited Oct 15 '09 at 0:31
answered Oct 14 '09 at 21:47
...
How can I add a help method to a shell script?
...
177
here's an example for bash:
usage="$(basename "$0") [-h] [-s n] -- program to calculate the an...
How to find the JVM version from a program?
...
10 Answers
10
Active
...
How to get indices of a sorted array in Python
...
11 Answers
11
Active
...
Why does Eclipse complain about @Override on interface methods?
...
10 Answers
10
Active
...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
...
114
As a hobbyist operating system writer, I found that because paging (a major part of the modern...
quick random row selection in Postgres
...ith OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hatchkins)
You must use floor here:
SELECT myid FROM mytable OFFSET floor(random()*N) L...
What is the difference between return and return()?
I tested the above code in Chrome's console, and both returned 1 .
9 Answers
9
...
How to remove the left part of a string?
...
answered Apr 25 at 21:01
Xavier GuihotXavier Guihot
23.7k1414 gold badges132132 silver badges9696 bronze badges
...