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How to find the size of an array in postgresql
...e trick. Or if you know that the array is 1-dimensional (which is likely) and are running PostgreSQL 9.4 or higher, you can use cardinality:
SELECT cardinality(id) FROM example;
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How to parse/format dates with LocalDateTime? (Java 8)
Java 8 added a new java.time API for working with dates and times ( JSR 310 ).
7 Answers
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Difference between Document-based and Key/Value-based databases?
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The main differences are the data model and the querying capabilities.
Key-value stores
The first type is very simple and probably doesn't need any further explanation.
Data model: more than key-value stores
Although there is some debate on the correct name for...
List of remotes for a Git repository?
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You can get a list of any configured remote URLs with the command git remote -v.
This will give you something like the following:
base /home/***/htdocs/base (fetch)
base /home/***/htdocs/base (push)
origin git@bitbucket.org:*** (fetch)
origin git@bitbucket.org:*** (push)
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Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...is example, I am assuming that all your image files contain the string IMG and you want to replace IMG with VACATION.
The shell automatically evaluates *.jpg to all the matching files.
The second argument of mv (the new name of the file) is the output of the sed command that replaces IMG with VACATI...
What do the plus and minus signs mean in Objective-C next to a method?
In Objective-C, I would like to know what the + and - signs next to a method definition mean.
4 Answers
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Moment js date time comparison
I'm using moment.js to format my date time, here I have two date values, and I want to achieve a particular function when one date is greater than the other. I read most of their docs, but didn't find the function to achieve this. I know it will be there.
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Get file name and extension in Ruby
...m working on a program to download a video from YouTube, convert it to MP3 and create a directory structure for the files.
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Is it safe to delete a void pointer?
... is good to avoid undefined behavior, although the topic itself is complex and filled with conflicting opinions.
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How to view AndroidManifest.xml from APK file?
Is it possible to view Androidmanifest.xml file?
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