大约有 41,300 项符合查询结果（耗时：0.0480秒） [XML]
How to count occurrences of a column value efficiently in SQL?
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263
This should work:
SELECT age, count(age)
FROM Students
GROUP by age
If you need the id a...
How to see full symlink path
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edited Feb 14 '14 at 12:34
answered Apr 15 '13 at 14:32
I...
Why do people say that Ruby is slow? [closed]
...en?
Most folks are waiting for Ruby 1.9.1. I myself am waiting for Rails 3.1 on Ruby 1.9.1 on JRuby.
Finally, please remember that a lot of developers choose Ruby because it makes programming a more joyful experience compared to other languages, and because Ruby with Rails enables skilled web de...
Rails respond_with: how does it work?
...eading here and there about how cool the respond_with method is in Rails 3. But I can't even find a reference to it in either the Rails APIs or by searching the source. Can anyone either explain to me how it works (what options you can use, etc) or point me to the place it's actually implemented s...
What are deferred objects?
...n custom Deferred Objects. How do they work?
– user113716
Feb 1 '11 at 18:59
3
Actually I'm serio...
How to print a debug log?
...error messages appear straight to console, ie: error_log("You messed up!", 3, "php://stdout");
– stefgosselin
May 21 '11 at 12:38
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Open Redis port for remote connections
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edited Sep 7 '17 at 13:00
answered Sep 30 '13 at 9:53
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Pinging servers in Python
...tion works in any OS (Unix, Linux, macOS, and Windows)
Python 2 and Python 3
EDITS:
By @radato os.system was replaced by subprocess.call. This avoids shell injection vulnerability in cases where your hostname string might not be validated.
import platform # For getting the operating system name...
Visually managing MongoDB documents and collections [closed]
... syntax highlighting and code formatting (plus auto-save, something Studio 3T doesn't support), visual tools (explain plan, real-time performance dashboard, query and aggregation pipeline builder), profiling manager, storage analyzer, index advisor, convert MongoDB commands to Node.js syntax etc. La...
Member initialization while using delegated constructor
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edited Aug 30 '12 at 5:34
answered Aug 30 '12 at 4:55
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