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Postgres unique constraint vs index
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is it actual info? especially about partial indexes
– anatol
Feb 20 '19 at 6:30
1
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What's the difference between git reflog and log?
...eline --graph --decorate.)
git reflog doesn't traverse HEAD's ancestry at all. The reflog is an ordered list of the commits that HEAD has pointed to: it's undo history for your repo. The reflog isn't part of the repo itself (it's stored separately to the commits themselves) and isn't included in pu...
Oracle JDBC ojdbc6 Jar as a Maven Dependency
...ory (preferably using your own artifactory) to your project instead of installing it to your local repository.
Maven syntax:
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency&...
How do I exit the Vim editor?
...ite if there are changes)
:exit to write and exit (same as :x)
:qa to quit all (short for :quitall)
:cq to quit without saving and make Vim return non-zero error (i.e. exit with error)
You can also exit Vim directly from "Normal mode" by typing ZZ to save and quit (same as :x) or ZQ to just quit (...
Can I change the fill color of an svg path with CSS?
...h the element, just as when styling HTML. If you just want to apply it to all SVG paths, you could use, for example:
path {
fill: blue;
}
External CSS appears to override the path's fill attribute, at least in WebKit and Gecko-based browsers I tested. Of course, if you write, say, <...
Why Java needs Serializable interface?
...specify Serializable tag on every object we use is kind of a burden. Especially when it's a 3rd-party class that we can't really change.
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How to detect the screen resolution with JavaScript?
Is there a way that works for all browsers?
12 Answers
12
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Getting the difference between two sets
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Try this
test2.removeAll(test1);
Set#removeAll
Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively modifies thi...
What is ActiveMQ used for - can we apply messaging concept using a Database?
...that up communicating thousands of messages per second, Databases tend to fall over.
Message-oriented middle-ware [MOM] like ActiveMQ on the other hand are built to handle those use cases.
They assume that messages in a healthy system will be deleted very quickly and can do optimizations to avoid t...
Are soft deletes a good idea? [duplicate]
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I say it's a bad idea, generally (with some exceptions, perhaps).
First, your database should be backed up regularly, so you should never be in a situation where you would lose data permanently because of a DELETE (unless it's a deletion of just-adde...