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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是分成不同的Block，然后对各个Block进行纠错编码，对于如何分组，我们可以查看QR Code Spec的第33页到44页的Table-13到Table-22的定义表。注意最后两列：
Number of Error Code Correction Blocks ：需要分多少个块。
Error Correction Code Per Blo...
MySQL ('root'@'%') does not exist 的问题 - 爬虫/数据库 - 清泛IT社区，为创新赋能！
MySQL ('root'@'%') does not exist的问题：
在使用mysql时出现问题： The user specified as a definer ('root'@'%') does not exist。
一般是由于root用户对全局host无访问权限。因此只要给root用户添加一个访问权限即可。
解决办法：
登陆mysql ，...
How do I import an SQL file using the command line in MySQL?
...
Try:
mysql -u username -p database_name < file.sql
Check MySQL Options.
Note-1: It is better to use the full path of the SQL file file.sql.
Note-2: Use -R and --triggers to keep the routines and triggers of original databas...
grant remote access of MySQL database from any IP address
...nd grants for both localhost and network access. And, of course, be sure mysqld is bound to 0.0.0.0 vs. 127.0.0.1.
– Charlie Reitzel
Aug 8 '19 at 18:41
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淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...淘宝目前的一些底层技术框架以及自己的一些感触来说说如何构建一个可 伸缩，高性能，高可用性的分布式互联网应用。时间过得很快，来淘宝已经两个月了，在这两个月的时间里，自己也感受颇深。下面就结合淘宝目前的一...
How do I find out my MySQL URL, host, port and username?
I need to find my MySQL username. When I open the MySQL command line client, it only asks me for my password. I don't remember my username. And for connectivity with JDBC, I need the URL, host and port number. Where do I find all of these?
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SQL JOIN and different types of JOINs
... film_actor fa
WHERE a.actor_id = fa.actor_id
)
Some folks (especially MySQL people) also write ANTI JOIN like this:
SELECT *
FROM actor a
LEFT JOIN film_actor fa
USING (actor_id)
WHERE film_id IS NULL
I think the historic reason is performance.
LATERAL JOIN
OMG, this one is too cool. I'm t...
How to get a list of user accounts using the command line in MySQL?
I'm using the MySQL command line utility and can navigate through a database. Now I need to see a list of user accounts. How can I do this?
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How to see log files in MySQL?
I've read that Mysql server creates a log file where it keeps a record of all activities - like when and what queries execute.
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Is there a way to only install the mysql client (Linux)?
Are there are any Linux mysql command line tools that don't require the entire mysql db installation package to be installed?
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