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• In SQL, what's the difference between count(column) and count(*)?

  - by Bill the Lizard

  I have the following query: select column_name, count(column_name) from table group by column_name having count(column_name) > 1; What would be the difference if I replaced all calls to count(column_name) to count(*)? This question was inspired by a previous one. Edit: To clarify the accepted answer (and maybe my question), using count(*) in this case returns an extra row in the result that contains a null and the count of null values in the column.

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• what is the difference between digital signature and digital certificate?

  - by Bugzy bug

  Hey guys, i've been google'ing the difference between digital signature and digital certificate (asymmetric encryption) seems like they are the same. I would like to clarify if they are the same or not? many thanks!!!

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• What's the difference between OracleServiceORAL service(on Window XP) and Oracle instance?

  - by Yousui

  Hi guys, I want to know what's the difference between OracleServiceORAL service(on Window XP) and Oracle instance. Great thanks.

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• What is difference of developing a webiste in MVC and 3-Tier or N-tier architecture?

  - by Starx

  What is difference of developing a website in MVC and 3-Tier or N-tier architecture? Which one is better? What are pros and cons?

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• What is the difference between connection and read timeout for sockets?

  - by corgrath

  3 questions: 1) What is the difference between connection and read timeout for sockets? 2) What does connection timeout set to "infinity" mean? In what situation can it remain in an infinitive loop? and what can trigger that the infinity-loop dies? 3) What does read timeout set to "infinity" mean? In what situation can it remain in an infinitive loop? and what can trigger that the infinity-loop dies?

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• What is the difference between a generic type and a generic type definition?

  - by Micah

  I'm Studying up on .net reflection and am having a hard time figuring out the difference. From what I understand, List is a generic type definition. Does that mean that to .net reflection T is the generic type? Specifically, I guess I'm looking for more background on the Type.IsGenericType and Type.IsGenericTypeDefinition functions. Thanks!

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• What is the difference between Where and FindAll? [closed]

  - by Matthew

  Possible Duplicate: FindAll vs Where extension-method IEnumerable has two extension methods, Where and FindAll. Both seem to take a Predicate, and return an IEnumerable of the matching elements in the original IEnumerable. So what is the difference between them?

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• What is the difference between Extends Application and Extends Activity in Android?

  - by LordSnoutimus

  I am confused as to the difference between the two. In my application I have just used Extends Activity and the application is working perfectly, so what is the purpose of Extends Application?. Would you use it on the first class you create in the Android application? Thanks.

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• What's difference between primitive and wrapper class in JPA (Hibernate) column mappings?

  - by Michael Lu

  For instance, there’s a integer column in a database table. Then in java model, it can be mapped both as primitive int and Integer. My question is what's difference between the int and Integer in this case? And performance concern? Thanks!

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• How to determine the difference among dates in the same column?

  - by Vera

  How to determine the difference among dates of birth? +----------+----------+------------+ | id | name | birth | +----------+----------+------------+ | 00001 | Claws | 2010-04-17 | | 00002 | Claws | 2010-01-31 | | 00003 | Claws | 2009-11-31 | | 00004 | Claws | 2009-09-31 | | 00005 | Claws | 2009-07-31 | | 00006 | Claws | 2008-10-31 | +----------+----------+------------+ I would like to obtain this: +----------+----------+------------+------------------------------------------+ | id | name | birth | diff | +----------+----------+------------+------------------------------------------+ | 00001 | Claws | 2010-04-17 | diff (id1-id2) = 2010-01-31 - 2010-04-17 | | 00002 | Claws | 2010-01-31 | diff (id2-id3) = 2010-01-31 - 2009-11-31 | | 00003 | Claws | 2009-11-31 | diff (id3-id4) = 2010-01-31 - 2009-09-31 | If possible, ORDER BY diff DESC Thank you for helping Vera

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• Is there any difference between using typeset in ksh to simply setting a variable?

  - by ennuikiller

  Are the following 2 lines completely equivalent? If not what's the difference? I've seen plently of shellscripts utilize number 1 and was just wondering what it gives you compared with number 2. typeset TARGET="${XMS_HOME}/common/jxb/config/${RUNGROUP}.${ENV}.properties" TARGET="${XMS_HOME}/common/jxb/config/${RUNGROUP}.${ENV}.properties"

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• What's the difference been NoSQL and a Column-Oriented database?

  - by Tedk

  The more I read about NoSQL, the more it begins to sound like a column oriented database to me. What's the difference between NoSQL (e.g. CouchDB, Cassandra, MongoDB) and a column oriented database (e.g. Vertica, MonetDB)?

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• Performance difference if I UNION first, then put WHERE on unioned result set?

  - by Dennis

  In Microsoft SQL, is there any difference in performance between this: SELECT columns FROM table1 WHERE cond UNION SELECT columns FROM table2 WHERE cond and this: SELECT columns FROM ( SELECT columns FROM table1 UNION SELECT columns FROM table2 ) WHERE cond ?

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• What is the difference between System.Linq and System.Data.Linq?

  - by Sergio Tapia

  I was having troubles earlier while trying to declare a ChangeAction parameter in a method, with the IDE saying I might be missing a Namespace. So I right click it and Resolve it and find that System.Data.Linq has been added and now everything is fine. What is the difference between these two namespaces?

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• Any difference in performance/compatibility of different languages in PostgreSQL?

  - by Igor

  In nowadays the PostgreSQL offers plenty of procedural languages: pl/pgsql, pl/perl, etc Are there any difference in the speed/memory consumption in procedures written in different languages? Does anybody have done any test? Is it true that to use the native pl/pgsql is the most correct choice? How the procedure written in C++ and compiled into loadable module differs in all parameter w.r.t. the user function written with pl/* languages?

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• what's the difference between GetElementByID and findComponent in JavaScript?

  - by RoboShop

  Hi, I'm a .NET programmer who've just started to learn more about client side scripting, and I was wondering sometimes you use $get('value') and $find('value') and I've discovered that these are just shortcuts for $get = GetElementByID $find = FindComponent however, I still don't understand, what is the difference between these two functions in JavaScript? Thanks in advance.

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• What is the difference between N-Tier Structure of any Information Technology and Programming?

  - by Starx

  I recently came to know that, different Information Technology are also based on N-Tier Architecture. For example, a Web Technology is usually 3-Tier Architecture: The user, The Web Server and The Database Server. But we also develop various applications in N-tier. What are the difference between these two and how are they related to each other.

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• What's the difference between using the thread pool and a normal thread?

  - by Maslow

  I Was reading random questions and answers here on SO and came across this question: C#, IAsyncResult and the thread pool The question is asked is X method using the thread pool or using normal threads. What's the difference between using the thread pool and a normal thread?

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• Does it make a difference whether I put 'friend class xxxxx' in the public or private section?

  - by Kyle

  class A1 { public: friend class B; } class A2 { private: friend class B; } Any difference?

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• What is the difference between solicit and unsolicit messages/events?

  - by AKN

  In window programming, what is the difference between solicit and unsolicit message or events. I have seen some saying like we have handled solic or unsolic messages. What is that actually? Can someone pls help on this?

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• what is the Difference between Session id and Session key ?

  - by Vishwanath dalvi

  If v consider this two in any web app.. Session id vs Session key.. wt is the exact difference between them ?

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• What is the difference between N-Tier Architecture of Information Technology and Programming?

  - by Starx

  I recently came to know that, different Information Technology are also based on N-Tier Architecture. For example, a Web Technology is usually 3-Tier Architecture: The user, The Web Server and The Database Server. But we also develop various applications in N-tier. What are the difference between these two and how are they related to each other.

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• API's to access 'Novell GroupWise' data for c#.What will be difference if i use "gwtapp.dll" or "Gro

  - by Preeti

  Hi, I want to read mail,calendar,contact items from Novell GroupWise Client.(using version 8). How to start with? Which API is best for this? What will be difference if i use "gwtapp.dll" or "GroupWise Web Services" ? thanx

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• What is the difference between the Boolean object and the Boolean data type in JavaScript?

  - by DarkLightA

  The Boolean type has two literal values: true and false. Do not confuse the primitive Boolean values true and false with the true and false values of the Boolean object. The Boolean object is a wrapper around the primitive Boolean data type. See Boolean Object for more information. What does this mean? What's the difference between the Boolean object and the Boolean data type??

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• Is there any performance difference between a SQL "IN" statement versus using "OR"?

  - by Mark Kadlec

  Thought I would ask the knowledgeable StackOverflow community a question that was on my mind today and I can't seem to find an answer. Is there any performance difference or advantage between an "IN" or using "OR"? Ie. Is SELECT type FROM types WHERE typecat IN ('abc', 'def') better than SELECT type FROM types WHERE typecat = 'abc' OR typecat = 'def'

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