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Difference between Key, Primary Key, Unique Key and Index in MySQL
When should I use KEY , PRIMARY KEY , UNIQUE KEY and INDEX ?
8 Answers
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ExecutorService, how to wait for all tasks to finish
... if asked.) This avoids all the manual shutdown, awaitTermination, etc... and allows you to reuse this ExecutorService neatly for multiple cycles, if desired.
There are a few related questions on SO:
How to wait for all threads to finish
Return values from java threads
invokeAll() not willing to...
How to make a class JSON serializable
...you want more customized output then you will have to subclass JSONEncoder and implement your own custom serialization.
For a trivial example, see below.
>>> from json import JSONEncoder
>>> class MyEncoder(JSONEncoder):
def default(self, o):
return o.__dict_...
What is the difference between and ? [duplicate]
...ble piece of code I use the directive <%@include file="reuse.html"%> and in the second I use the tag <jsp:include page="reuse.html" />.
Let the code in the reusable file be :
<html>
<head>
<title>reusable</title>
<meta http-equiv="Content-Type" conten...
Is there common street addresses database design for all addresses of the world? [closed]
I am a programmer and to be honest don't know street address structures of the world, just how in my country is structured :) so which is the best and common database design for storing street addresses? It should be so simple to use, fast to query and dynamic to store all street addresses of the w...
How to add Web API to an existing ASP.NET MVC 4 Web Application project?
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I upgraded a project from MVC3 to 4 as well and also needed to add a reference to System.Web.Http.
– Damien Sawyer
Oct 16 '12 at 22:16
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Android: integer from xml resource
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@Terry So is this the preferred method to use Integers in android, I usually hard code it in the code itself. What is your reccomendation?
– capt.swag
Dec 20 '15 at 5:51
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How can I remove a specific item from an array?
I have an array of numbers and I'm using the .push() method to add elements to it.
97 Answers
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Unique constraint that allows empty values in MySQL
... postfix: "",
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In what order do static/instance initializer blocks in Java run?
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See section 12.4 and 12.5 of the JLS version 8, they go into gory detail about all of this (12.4 for static and 12.5 for instance variables).
For static initialization (section 12.4):
A class or interface type T will be initialized immediat...