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Can I have multiple primary keys in a single table?
...ider normalizing your relation.
Example:
Person(id, name, email, street, zip_code, area)
There can be a functional dependency between id -> name,email, street, zip_code and area
But often a zip_code is associated with a area and thus there is an internal functional dependecy between zip_code ...
Iterate a list with indexes in Python
...
Here's another using the zip function.
>>> a = [3, 7, 19]
>>> zip(range(len(a)), a)
[(0, 3), (1, 7), (2, 19)]
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How do you deploy your ASP.NET applications to live servers?
...project.com/KB/install/deployer.aspx
I publish website to a local folder, zip it, then upload it over FTP. Deployer on server then extracts zip, replaces config values (in Web.Config and other files), and that's it.
Of course for first run you need to connect to the server and setup IIS WebSite, d...
App Inventor 2 DynamicComponents 拓展：动态创建AI2组件对象 · App Inventor 2 中文网
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DynamicComponents 拓展
🧩 代码块
异步支持
案例
FAQ
基准测试结果
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DynamicComponents 拓展
.aix 拓展下载（最新版 v2.3.0）：
com.yusufcihan.DynamicComponents.aix
...
滚动布局管理器拓展 - ScrollArrangementHandler · App Inventor 2 中文网
...换 目录 在线 客服 扫码添加客服咨询 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", ...
SVG图像加载扩展 - 第三方扩展集合 · App Inventor 2 中文网
...适当的viewBox以支持缩放
优化文件大小: 移除不必要的代码和注释
测试兼容性: 确保SVG在不同Android版本上正常显示
文件路径示例
资源文件: "file:///android_asset/icon.svg"
外部存储: "/storage/emulated/0/Documents/icon....
TCPServer TCP服务器扩展：在Android设备上创建TCP服务器 · App Inventor 2 中文网
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示例项目功能
基本用法
代码示例
注意事项
错误代码
原文链接
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TCPServer TCP服务器扩展
介绍
此扩展使 TCP 客户端能...
WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...换 目录 在线 客服 扫码添加客服咨询 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", ...
How can I install a local gem?
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I download a gem such as rubygems in zip format. So there is no .gem file here. How do I install this from local ? Thank you.
– Erran Morad
Jan 10 '15 at 0:15
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What is the most efficient way to loop through dataframes with pandas? [duplicate]
...r[1], ir[2]))
B.append(time.time()-A)
C = []
A = time.time()
for r in zip(t['a'], t['b']):
C.append((r[0], r[1]))
B.append(time.time()-A)
print B
Result:
[0.5639059543609619, 0.017839908599853516, 0.005645036697387695]
This is probably not the best way to measure the time consumption ...