大约有 7,500 项符合查询结果（耗时：0.0210秒） [XML]
postgresql return 0 if returned value is null
... are NULL values in the query.
For all versions I've tested, postgres and mysql will ignore all NULL values when averaging, and it will return NULL if there is nothing to average over. This generally makes sense, as NULL is to be considered "unknown". If you want to override this you can use coale...
How to specify maven's distributionManagement organisation wide?
...el as the rest of the modules and have your aggregator pom.xml file at the root of where all your modules' directories exist.
- pom.xml (aggregator)
- project-parent
- project-module1
- project-module2
What you do with this structure is include your parent module in the aggregator and...
deciding among subprocess, multiprocessing, and thread in Python?
...e introduction to concurrency in the Python3 docs.
– root-11
Oct 17 '18 at 8:35
1
@root-11 you're...
How many bytes does one Unicode character take?
...ints.net/.
I wasted a lot of time on this useless list (but it's sorted!).
MySQL has a charset called "utf8" which actually does not support characters longer than 3 bytes. So you can't insert a pile of poo, the field will be silently truncated. Use "utf8mb4" instead.
There's a snowman test page (un...
Spring Boot application as a Service
...ou might want to add ordering statements to the [Unit] section, e.g. After=mysql.service, Before=apache2.service.
– rustyx
Jan 25 at 9:41
|
...
Nginx no-www to www and www to no-www
...x.html;
####
# now pull the site from one directory #
root /var/www/www.google.com/web;
# done #
location = /favicon.ico {
log_not_found off;
access_log off;
}
}
...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...his 5-day long automated test and stored the generated unique strings in a MySQL database.
During this test period, I used 5 different lengths (5, 10, 15, 20, 50) and +/-0.5 million records were inserted for each length. During my test, only the length 5 generated +/-3K duplicates out of 0.5 million...
Error message “Forbidden You don't have permission to access / on this server” [closed]
...0>
....
# Set access permission
<Directory "/path/to/docroot">
Allow from all
</Directory>
....
</VirtualHost>
As of Apache-2.4, however, access control is done using the new module mod_authz_host (Upgrading to 2.4 from 2.2). Consequently, the new...
Is there any NoSQL data store that is ACID compliant?
... Good answer. You can have both NoSQL+ACID and non-ACID-RDBMS (think MySQL + MyISAM). I'd usually consider NoSQL as "eventually consistent". I'll throw in the CAP theorem too... :-)
– gbn
Feb 27 '12 at 9:48
...
Protecting executable from reverse engineering?
...eed to obfuscate code if the code were uncrackable in the first place. The root of the problem is crackable software. Fix the root of your problem, don't just obfuscate it.
Also, the more confusing you make your code, the harder it will be for YOU to find security bugs. Yes, it will be hard for hac...