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How to change column datatype from character to numeric in PostgreSQL 8.4
I am using following query:
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Detect if homebrew package is installed
I'm about to write a shell script to detect if several homebrew packages are installed in the system. Is there a way to use a brew command to achieve that?
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pandas: multiple conditions while indexing data frame - unexpected behavior
I am filtering rows in a dataframe by values in two columns.
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CSS filter: make color image with transparency white
I have a colored png image with transparency. I would like to use css filter to make the whole image white but leave the transparency as it is.
Is that possible in CSS?
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How to pass the -D System properties while testing on Eclipse?
I am developing on Eclipse on Windows and Code gets deployed on Unix. I am fetching the system property values using System.getProperty("key") ... How do I pass this in Eclipse so that I do not have to modify the code and it works on Eclipse for debugging?
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How to get the max of two values in MySQL?
...REATEST(2,1);
Note: Whenever if any single value contains null at that time this function always returns null (Thanks to user @sanghavi7)
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Spring: how do I inject an HttpServletRequest into a request-scoped bean?
I'm trying to set up a request-scoped bean in Spring.
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Express res.sendfile throwing forbidden error
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I believe it's because of the relative path; the "../" is considered malicious. Resolve the local path first, then call res.sendfile. You can resolve the path with path.resolve beforehand.
var path = require('path');
res.sendFile(path.resolve('temp/index.html'));
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How to avoid warning when introducing NAs by coercion
...warnings, but I don't know how to avoid getting a warning when using as.numeric to convert a character vector.
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Rails: select unique values from a column
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Model.select(:rating)
Result of this is a collection of Model objects. Not plain ratings. And from uniq's point of view, they are completely different. You can use this:
Model.select(:rating).map(&:rating).uniq
or th...