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How to prepend a string to a column value in MySQL?
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Many string update functions in MySQL seems to be working like this:
If one argument is null, then concatenation or other functions return null too.
So, to update a field with null value, first set it to a non-null value, such as ''
For example:
update ta...
Using os.walk() to recursively traverse directories in Python
I want to navigate from the root directory to all other directories within and print the same.
13 Answers
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Get Root Directory Path of a PHP project
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this is just awesome, I tried $_SERVER['DOCUMENT_ROOT'], dirname(), $_SERVER['SCRIPT_NAME'] etc. but this worked excellently!
– webblover
Nov 26 '14 at 16:40
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How can I get the SQL of a PreparedStatement?
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This also depends on the implementation. In MySQL -- at least the version I was using a few years ago -- the JDBC driver actually built a conventional SQL query from the template and bind variables. I guess that version of MySQL didn't support prepared statements nativ...
实战做项目如何选择开源许可协议（二）- 开放代码 - 开源 & Github - 清泛...
实战做项目如何选择开源许可协议（二）- 开放代码opensource_code通过《实战做项目如何选择开源许可协议（一）-了解协议》大概知道了有哪些开源协议和各个协议的作用和区别。我们准备把代码开放出去时，需...通过《实战做项...
【动图】AppInventor2如何播放gif动图？如何播放动画？ - App Inventor 2 ...
...会发现图片不会动，只会展示静态图片。那么问题来了，如何展示动图/动画效果呢？
播放动态图，两种思路：
1、使用网络 url 的 gif 图片，设置为 web 浏览器的链接地址，会自动播放网络动图，一直循环播放不能控制停止，...
糯米推全景地图 让竞争对手们如何接招？ - 资讯 - 清泛网 - 专注C/C++及内核技术
糯米推全景地图 让竞争对手们如何接招？【糯米推全景地图 让竞争对手们如何接招？】当然，新美大、腾讯、阿里可以效仿，可以克隆，可以尽快迎头赶上。其实，我很看好阿里能够迎头赶上，但阿里会如我所愿吗？当然，新...
中文网（自研/维护）拓展 · App Inventor 2 中文网
...果是则返回’真’，否则返回’假’。
ResetFirstRun()
重置App的运行状态为第一次运行。
SystemSettings()
跳转到系统设置界面
WirelessSettings()
跳转到无线和网络设置界面
AirPlaneState
Component for AirPlaneState
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What resources exist for Database performance-tuning? [closed]
...er to a not-the-same-inquiry is probably a good start.
Hidden Features of MySQL
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What's the difference between using INDEX vs KEY in MySQL?
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Here is a nice description about the "difference":
"MySQL requires every Key also be indexed, that's an implementation
detail specific to MySQL to improve performance."
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