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MySQL “Group By” and “Order By”
... non-aggregate columns in a SELECT with a GROUP BY clause is non-standard. MySQL will generally return the values of the first row it finds and discard the rest. Any ORDER BY clauses will only apply to the returned column value, not to the discarded ones.
IMPORTANT UPDATE
Selecting non-aggregate col...
Set value to NULL in MySQL
...
You're probably quoting 'NULL'. NULL is a reserved word in MySQL, and can be inserted/updated without quotes:
INSERT INTO user (name, something_optional) VALUES ("Joe", NULL);
UPDATE user SET something_optional = NULL;
...
MySQL ON DUPLICATE KEY - last insert id?
...heck this page out: https://web.archive.org/web/20150329004325/https://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html
At the bottom of the page they explain how you can make LAST_INSERT_ID meaningful for updates by passing an expression to that MySQL function.
From the MySQL documentation...
No module named MySQLdb
I am using Python version 2.5.4 and install MySQL version 5.0 and Django. Django is working fine with Python, but not MySQL. I am using it in Windows Vista.
...
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...
MySQL error code: 1175 during UPDATE in MySQL Workbench
I'm trying to update the column visited to give it the value 1. I use MySQL workbench, and I'm writing the statement in the SQL editor from inside the workbench. I'm writing the following command:
...
MySQL 'create schema' and 'create database' - Is there any difference
... between the create schema command and the create database command for MySQL.
6 Answers
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BugTrap程序崩溃快照上传服务端开发配置 - C/C++ - 清泛网 - 专注C/C++及内核技术
...篇《BugTrap：程序崩溃快照、bug跟踪之利器》详细介绍了如何利用BugTrap监控程序崩溃，这里继续介绍如何将客户端的崩溃包上传至服务器端（当然前提是用户选择“发送报告”）。上一篇《BugTrap：程序崩溃快照、bug跟踪之利器》...
程序员找女朋友的技术攻略：实战篇 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...确需求是很难达到预期效果的。这次，我们来谈谈程序员如何找女朋友，如何找到女朋友，这里有几点战略性的建议：
一、如何搭讪
• 不要害羞
有一部分程序员“天生不够淫荡”，看到女生就会脸红，尤其是自己喜欢的...
一张图告诉你是需要 SQL 还是 Hadoop - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...己的项目，什么时候用 SQL，什么时候用 Hadoop，它们之间如何取舍？Aaron Cordova 用一张图来回答你这个问题，对于不同的数据场景，如何选取正确的数据存储处理工具进行了详细描述。Aaron Cordova 是美国大数据分析及架构专家，Kov...