大约有 47,000 项符合查询结果（耗时：0.1473秒） [XML]
Fetch the row which has the Max value for a column
...
This will retrieve all rows for which the my_date column value is equal to the maximum value of my_date for that userid. This may retrieve multiple rows for the userid where the maximum date is on multiple rows.
select userid,
my_date,
...
Spring - @Transactional - What happens in background?
I want to know what actually happens when you annotate a method with @Transactional ?
Of course, I know that Spring will wrap that method in a Transaction.
...
What exactly is Python multiprocessing Module's .join() Method Doing?
... threading or multiprocessing, is not related to str.join() - it's not actually concatenating anything together. Rather, it just means "wait for this [thread/process] to complete". The name join is used because the multiprocessing module's API is meant to look as similar to the threading module's AP...
Something better than .NET Reflector? [closed]
...y, but ever since Red Gate Software took over it has gone downhill dramatically. Now it forces me to update (which is absolutely ridiculous), half the time the update doesn't go smoothly, and it is increasingly hindering my productivity with each update. I am sick of it, and I am ready for something...
gradle build fails on lint task
...ude each other
*/
android {
lintOptions {
// use this line to check all rules except those listed
disable 'RuleToDisable', 'SecondRuleToDisable'
// use this line to check just listed rules
enable 'FirstRuleToCheck', 'LastRuleToCheck'
}
}
...
How much faster is C++ than C#?
... more advanced JIT optimizations being complicated to implement, and the really cool ones are only arriving just now.
So C++ is faster, in many cases. But this is only part of the answer. The cases where C++ is actually faster, are highly optimized programs, where expert programmers thoroughly opti...
How can I prevent Visual Studio 2013 from closing my IIS Express app when I end debugging?
... edited Feb 22 at 17:13
Callum Watkins
2,22222 gold badges2323 silver badges4040 bronze badges
answered Oct 24 '13 at 15:31
...
How do I get SUM function in MySQL to return '0' if no values are found?
...iddle.com/#!2/d1542/3/0
More Information:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
val INT
);
INSERT INTO foo (val) VALUES
(null),(1),(n...
Eclipse - java.lang.ClassNotFoundException
...-classes also under the web project and so.
Using this configuration will allow you to execute unit tests in eclipse.
Just one more advice, if your web project's tests require some configuration files that are under the resources, be sure to include that folder as a source folder and to make the p...
How can I view all historical changes to a file in SVN
...
There's no built-in command for it, so I usually just do something like this:
#!/bin/bash
# history_of_file
#
# Outputs the full history of a given file as a sequence of
# logentry/diff pairs. The first revision of the file is emitted as
# full text since there's no...