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MySQL: Order by field size/length
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@mastazi according to MySQL documentation: OCTET_LENGTH() is a synonym for LENGTH().
– Heitor
Oct 1 '17 at 5:35
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Is there a MySQL option/feature to track history of changes to records?
I've been asked if I can keep track of the changes to the records in a MySQL database. So when a field has been changed, the old vs new is available and the date this took place. Is there a feature or common technique to do this?
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How do I rename a column in a database table using SQL?
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This is not supported in MySQL, is it?
– ustun
Oct 21 '11 at 11:41
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Multiple queries executed in java in single statement
...BC as it currently provides an exception even though it is possible in the MySQL query browser.
6 Answers
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MySQL - ORDER BY values within IN()
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@Vladimir - yes, it is MySQL-specific. The question has the mysql tag.
– Ayman Hourieh
Jun 6 '09 at 1:10
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How do I find which transaction is causing a “Waiting for table metadata lock” state?
...ransactions waiting for locks:
SELECT TRX_ID, TRX_REQUESTED_LOCK_ID, TRX_MYSQL_THREAD_ID, TRX_QUERY
FROM INNODB_TRX
WHERE TRX_STATE = 'LOCK WAIT';
Reference - MySQL Troubleshooting: What To Do When Queries Don't Work, Chapter 6 - Page 96.
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13 个免费学习编程的好地方 - 创意 - 清泛网 - 专注C/C++及内核技术
...同，大多数企业家、威客、运营都会告诉你，学点编程能如何让自己更加成功。过去 曾几何时，懂编程的都是些顶级极客，但是现在，情况已大不相同，大多数企业家、威客、运营都会告诉你，学点编程能如何让自己更加成功...
ATL COM开发入门（一）（JS调用ActiveX/COM组件） - C/C++ - 清泛网 - 专注C/C++及内核技术
...它进行COM开发。本文通过一个基础入门的例子，简要介绍如何定义、实现C...ATL（Active Template Library）动态模板库，是一个类库，可以使用它进行COM开发。本文通过一个基础入门的例子，简要介绍如何定义、实现COM接口，前台如何...
ATL COM开发入门（二）（ActiveX/COM组件回调JS） - C/C++ - 清泛网 - 专注C/C++及内核技术
...OM组件回调JS）ATL回调js函数、ATL定时器使用方法、ATL后台如何获取并操作前台DOM元素。本文代码基于上篇《ATL COM开发入门（一）（JS调用ActiveX/COM组件）》。
完成的需求：后台ATL代码回调前台js函数，后台ATL启动定时器完成前台...
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