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Delimiters in MySQL
...tatements are each terminated by ;. That way, when the code is run in the mysql client, the client can tell where the entire procedure ends and execute it as a unit rather than executing the individual statements inside.
Note that the DELIMITER keyword is a function of the command line mysql client...
MySQL Insert into multiple tables? (Database normalization?)
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No, you can't insert into multiple tables in one MySQL command. You can however use transactions.
BEGIN;
INSERT INTO users (username, password)
VALUES('test', 'test');
INSERT INTO profiles (userid, bio, homepage)
VALUES(LAST_INSERT_ID(),'Hello world!', 'http://www.sta...
MySQL InnoDB not releasing disk space after deleting data rows from table
I have one MySQL table using the InnoDB storage engine; it contains about 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
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ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的开发中，还是帮助测试ros的关键部分——你都需要了解如何生成重要的调试日志。
对于开发者来说，如果想准确地找出和判断ros的运行状态，调试信息是非常重要的。从操作系统得到默认的调试输出很容易，但是这些输出对...
How do I set the time zone of MySQL?
...ight be useful:
There are three places where the timezone might be set in MySQL:
In the file "my.cnf" in the [mysqld] section
default-time-zone='+00:00'
@@global.time_zone variable
To see what value they are set to:
SELECT @@global.time_zone;
To set a value for it use either one:
SET GLOBA...
How to import an excel file in to a MySQL database
Can any one explain how to import a Microsoft Excel file in to a MySQL database?
11 Answers
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Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...（我还要去维护宇宙和平的好嘛）。
这篇文章讲的就是如何解决分布式系统的日志管理问题。先给大家看看最终的效果：
单个屏幕上所有服务器的日志实时滚动着显示。每条日志开头还标明日志的来源（下图）。
实现这...
Could not locate Gemfile
... thor (0.15.4)
Using railties (3.2.11)
Using jquery-rails (2.0.3)
Using mysql2 (0.3.11)
Using net-ldap (0.3.1)
Using ruby-openid (2.1.8)
Using rack-openid (1.3.1)
Using bundler (1.2.3)
Using rails (3.2.11)
Using rmagick (2.13.1)
Your bundle i
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How to check if mysql database exists
Is it possible to check if a (MySQL) database exists after having made a connection.
21 Answers
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Difference Between Schema / Database in MySQL
Is there a difference between a schema and a database in MySQL? In SQL Server, a database is a higher level container in relation to a schema.
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