大约有 40,000 项符合查询结果（耗时：0.0594秒） [XML]
Retrieving the last record in each group - MySQL
...
MySQL 8.0 now supports windowing functions, like almost all popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m...
What is JSON and why would I use it?
...the official documentation, but I still haven't got to the point where I really understand what JSON is, and why I'd use it.
...
What does Provider in JAX-RS mean?
...tomizing the JAX-RS runtime. You can think of them as plugins that (potentially) alter the behavior of the runtime, in order to accomplish a set of (program defined) goals.
Providers are not the same as resources classes, they exist, conceptually, at a level in-between resources classes and the JAX...
Sorting a set of values [closed]
... not surprising that set means "sorted list", and you have to say unordered_set to mean "set"…
– abarnert
Jul 3 '13 at 21:33
2
...
What are the -Xms and -Xmx parameters when starting JVM?
...
The flag Xmx specifies the maximum memory allocation pool for a Java virtual machine (JVM), while Xms specifies the initial memory allocation pool.
This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of ...
Typedef function pointer?
I'm learning how to dynamically load DLL's but what I don't understand is this line
6 Answers
...
How can I get the current language in Django?
...t: Returns None if translations are temporarily deactivated (by deactivate_all() or when None is passed to override()). Before Django 1.8, get_language() always returned LANGUAGE_CODE when translations were deactivated.
– Pieter
Jan 3 '17 at 13:11
...
Using reflect, how do you set the value of a struct field?
...rue if the value's
address can be obtained with Addr.
Such values are called addressable. A
value is addressable if it is an
element of a slice, an element of an
addressable array, a field of an
addressable struct, or the result of
dereferencing a pointer. If CanAddr
returns false, c...
ctypes - Beginner
...o testlib.so -fPIC testlib.c
# or... for Mac OS X
$ gcc -shared -Wl,-install_name,testlib.so -o testlib.so -fPIC testlib.c
Then, write a wrapper using ctypes:
testlibwrapper.py
import ctypes
testlib = ctypes.CDLL('/full/path/to/testlib.so')
testlib.myprint()
Now execute it:
$ python testlibwrap...
How do I obtain a Query Execution Plan in SQL Server?
...an execution plan, which one to use will depend on your circumstances. Usually you can use SQL Server Management Studio to get a plan, however if for some reason you can't run your query in SQL Server Management Studio then you might find it helpful to be able to obtain a plan via SQL Server Profil...