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• Difference between Locks, Mutex and Critical Sections

  - by viswanathan

  There is an existing question regarding difference between Mutex and Critical section but it does not deal with Locks also. So i want to know whether Critical sections can be used for thread synchronisation between processes. Also what is meant by signalled states and non-signalled states

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• What is the difference between (+) and (-) operator in obj c function

  - by niceramar

  Hi i am new to iphone and starts to learning Obj c. i have notice the function definition, for some function we are using (-) and for some function we are using (+) Example: + (id)requestWithURL:(NSURL *)theURL – initWithURL: what the difference between those two operator / symbol's usage? thanks!

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• Difference between C++ & C#

  - by Nilesh

  hi.... what is difference between c++ & c#? this question asked in interview.... Help me out.. Regards Nils

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• how to calculate time difference in PHP

  - by php learner

  I Have to calculate date time difference how to do that in PHP. I need exact hours , mins and secs. any body have the scripts for that please give me :-P

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• Difference between echo, print and printf

  - by Chakrapani

  please healp out my question... what is the difference between the following functions in php 1. echo 2. print 3. printf

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• Difference between macros and functions in C in relation to instruction memory and speed

  - by DAHANS

  To my understanding the difference between a macro and a function is, that a macro-call will be replaced by the instruction in the definition, and a function does the whole push, branch and pop -thing. Is this right, or have I understand something wrong? Additionally, if this is right, it would mean, that macros would take more space, but would be faster (because of the lack of the push,branch and pop instructions.), wouldn't it?

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• Is there any difference between most specific hypotheses obtained by Candidate Elimination and Find-

  - by leon

  In terms of machine learning. Is there any difference between most specific hypotheses obtained by Candidate Elimination and Find-S methods? Many Thanks

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• Difference between Object and object

  - by kbok

  Hello, In C# there are Object and object types. They seem to have the same functionnality, so what is the difference between the two ?

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• difference between where and nested queries

  - by Chris H

  I'm not able to figure out the difference between these queries. I'm pretty sure that the first one is an equi-join. I'm not sure how the second one ISN'T the same as the first. The sub query in #2 selects all Ids from S, and then it returns all R's that also have those ID's, no? SELECT R.cname FROM R, S, WHERE R.Id = S.Id SELECT R.cname FROM R WHERE R.Id IN (SELECT S.Id FROM S)

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• Difference between private, public and protected inheritance in C++

  - by Shikiyo

  i looked in SO and couldn't find a good description regarding the difference between public, private and protected C++ inheritance. All the questions were assuming an specific case.

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• Difference between a subsystem and a component

  - by WebMonster

  Hi! I would like to ask what is the difference between a subsystem and a component in the UML sense?

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• Difference between Inner Join & Full join

  - by Twinkle

  What is the difference between a full join and an inner join? When I do a full join I get 832 records and with an inner join I get 830 records.

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• Is there a difference between foreach and map?

  - by Robert Gould

  Ok this is more of a computer science question, than a question based on a particular language, but is there a difference between a map operation and a foreach operation? Or are they simply different names for the same thing?

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• What is the difference between these two statements (asp.net/c#/entity framework)

  - by user318573

  IEnumerable<Department> myQuery = (from D in myContext.Departments orderby D.DeptName select D); var myQuery = (from D in myContext.Departments orderby D.DeptName select D); What is the difference between these two statements above? In my little asp.net/C#/ EF4.0 app I can write them either way, and as far as how I want to use them, they both work, but there has to be a reason why I would choose one over the other?

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• Difference between "and" and "where" in joins

  - by Midhat

  Whats the difference between SELECT DISTINCT field1 FROM table1 cd JOIN table2 ON cd.Company = table2.Name and table2.Id IN (2728) and SELECT DISTINCT field1 FROM table1 cd JOIN table2 ON cd.Company = table2.Name where table2.Id IN (2728) both return the same result and both have the same explain output

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• what is the difference between MVC1 and MVC2

  - by Alaa

  I am using MVC design pattern in jsp-servlet web application, and want to what is the exact difference between MVC1 and MVC2 , can someone help? EDIT newly I hear that there is 2 versions of using MVC in servlet programming, I hear that in MVC1 there is kind of coupling between controller and view , but in MVC2 they overtake it, if someone know whether this is right or wrong I'll be very thankful.

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• Date difference in SQL Server 2005

  - by naveen

  Hi, I have two dates of the form Start Date: 2007-03-24, End Date: 2009-06-26 Now I need to find the difference between these two in the below form: 2 years, 3 months and 2 days Can someone please … in SQL Server 2005

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• Difference between dot and comma in PHP.

  - by user318466

  What is the difference between dot and comma when used in echo/print. echo '1','2'; echo '1'.'2'; produce the same output.

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• difference between erase and remove/remove_if algorithms?

  - by Eric

  What is really the difference between the algorithms remove and remove_if and the member function erase? Does both of them result in a call to the removed objects destructor?

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• Using rowDiffs() to calculate difference in values in matrix

  - by user1723765

  I'm using the rowDiffs() command to calculate the step by step difference in 116 rows in a matrix. I get the following error: Error in r[i1] - r[-length(r):-(length(r) - lag + 1L)] : non-numeric argument to binary operator I have no idea why this is happening. I could take the diff() separately for each row and it would work. Any ideas? Here's the data: https://dl.dropbox.com/u/22681355/data.csv Code: a=rowDiffs(data)

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• Difference between INSERT INTO and INSERT ALL INTO

  - by emily soto

  While I was inserting some records in table i found that.. INSERT INTO T_CANDYBAR_DATA SELECT CONSUMER_ID,CANDYBAR_NAME,SURVEY_YEAR,GENDER,1 AS STAT_TYPE,OVERALL_RATING FROM CANDYBAR_CONSUMPTION_DATA UNION SELECT CONSUMER_ID,CANDYBAR_NAME,SURVEY_YEAR,GENDER,2 AS STAT_TYPE,NUMBER_BARS_CONSUMED FROM CANDYBAR_CONSUMPTION_DATA; 79 rows inserted. INSERT ALL INTO t_candybar_data VALUES (consumer_id,candybar_name,survey_year,gender,1,overall_rating) INTO t_candybar_data VALUES (consumer_id,candybar_name,survey_year,gender,2,number_bars_consumed) SELECT * FROM candybar_consumption_data 86 rows inserted. I have read somewhere that INSERT ALL INTO automatically unions then why those difference is showing.

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• AuthComponent: Difference between allowedActions and allow()?

  - by takabanana

  What is the difference between using AuthComponent::allowedActions and AuthComponent::allow? When I Google, I see the majority of examples and documents using or talking about allow(), but only a few using allowedActions. But they both seem similar in usage.

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• PreferenceFragment - Difference between getPreferenceManager() and getPreferenceScreen()?

  - by Zynga Liker

  I've implemented my own PreferenceFragment subclass (detailed here), and want to listen for preference changes within it. PreferenceFragment provides you with two ways of doing this: getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); and getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); Which one should be used? What's the difference? I don't really understand the distinction made in the Android docs.

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• Difference between string comparrison in java

  - by Gandalf StormCrow

  Is there a difference between these ? if(myString.equals("")){ } if(myString.equals(null)){ } if(myString == ""){ } I have a string, I don't know is it empty or has some emtpy spaces I just wan't to stop it to be written in database if it is invalid(if empty or with some blank spaces).

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• difference between ajax and submit

  - by kawtousse

  hey, I just want to know what is the difference between sending parameter with ajax(post/get) to a servlet and sending them with "submit" . Thanks for your help.

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