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SQLite: How do I save the result of a query as a CSV file?
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Use sqlite> .output C:/Users/jdoe/Documents/output.csv if you want to use a specific path.
– Dustin
Mar 29 '16 at 14:01
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What does map(&:name) mean in Ruby?
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It's shorthand for tags.map(&:name.to_proc).join(' ')
If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block.
The Symbol#to_proc method was originally added by ActiveSupport but has...
What's a “static method” in C#?
...technical limitation that prevents calling a static method on an instance? If the compiler would allow it, what is the danger of it being accessible?
– kroonwijk
Sep 12 '11 at 19:09
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Print number of keys in Redis
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DBSIZE returns the number of keys and it's easier to parse.
Downside: if a key has expired it may still count.
http://redis.io/commands/dbsize
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How to Add a Dotted Underline Beneath HTML Text
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If the content has more than 1 line, adding a bottom border won't help. In that case you'll have to use,
text-decoration: underline;
text-decoration-style: dotted;
If you want more breathing space in between the text and t...
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7
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First, check to make sure that rake is mentioned in your Gemfile. If it's not, add it, and specify the version "you already activated".
Then, you'll need to tell bundle to update the rake version it's using for your app:
bundle update rake
It'll update your Gemfile.lock for you.
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多媒体组件 · App Inventor 2 中文网
... 设置文件选择器的字体，目前支持的字体有：default, serif, sans serif, 和 monospace。
要使用自定义字体，请将 .ttf 字体文件上传并选中它。选「Material 图标字体」后，文字里的图标英文名（如 home）显示成图标、其余文字照常...
Create a matrix of scatterplots (pairs() equivalent) in ggplot2
...ceting you have the same x and y on each sub-plot; with pairs, you have a different x on each column, and a different y on each row.
– naught101
Aug 21 '12 at 2:14
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How to reset sequence in postgres and fill id column with new data?
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If you don't want to retain the ordering of ids, then you can
ALTER SEQUENCE seq RESTART WITH 1;
UPDATE t SET idcolumn=nextval('seq');
I doubt there's an easy way to do that in the order of your choice without recreating t...
App Inventor 2 扩展资源汇总 - 社区扩展与工具合集 · App Inventor 2 中文网
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PuraVidaApps
https://puravidaapps.com/
FileTools、Taifun系列
KIO4
http://kio4.com/appinventor/
西班牙开发者，大量扩展
GitHub开源
搜索 “appinventor extension”
各种开源扩展
付...