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How to add column if not exists on PostgreSQL?

...o add column x to table y , but only when x column doesn't exist ? I found only solution here how to check if column exists. ...
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How do I find out with jQuery if an element is being animated?

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How to use sidebar with the keyboard in Sublime Text 2 and 3?

...u can navigate the folders with your arrow keys. If you prefer 'Vim' type settings, you can avoid using the arrow keys by remapping your keys to the typical Vim settings (hjkl). h will minimize/open a folder j will navigate down (i.e. down arrow) k will navigate up (i.e. up arrow) l will open up...
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Max length for client ip address [duplicate]

...maximum size for a database column storing client ip addresses? I have it set to 16 right now, but could I get an ip address that is longer than that with IPv6, etc? ...
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Concat all strings inside a List using LINQ

...j)); class description: public class Foo { public string Boo { get; set; } } Usage: class Program { static void Main(string[] args) { string delimiter = ","; List<Foo> items = new List<Foo>() { new Foo { Boo = "ABC" }, new Foo { Boo = "DEF" }, ...
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How to override equals method in Java

... } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } } Output: run: -- Subash Adhikari - VS - K fa...
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Postgresql query between date ranges

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Take the content of a list and append it to another list

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Loop through a date range with JavaScript

Given two Date() objects, where one is less than the other, how do I loop every day between the dates? 10 Answers ...
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Mongoose and multiple database in single node.js project

I'm doing a Node.js project that contains sub projects. One sub project will have one Mongodb database and Mongoose will be use for wrapping and querying db. But the problem is ...