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What is meaning of COUNT(DISTINCT column_name) ?

Interview question and answer by: Akiii | Posted on: 5/31/2012 | Category: SQL Server Interview questions | Views: 1384 | | Points: 40
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Answer:

COUNT(DISTINCT column_name) - returns the number of distinct values of the specified column


For example :- 

select COUNT(distinct store_name) from tbl_MEOC_information;


It will fetch distinct rows from the store_name column.


Thanks and Regards
Akiii

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 Responses
Posted by: Ras90it | Posted on: 01 Jun 2012 08:27:26 AM | Points: 10 | Alert Moderator 

distinct mean???

can u able to say clearly ???


Posted by: Akiii | Posted on: 01 Jun 2012 08:29:37 AM | Points: 10 | Alert Moderator 

Hi @Ras90it....

distinct means it will fetch or Count unique values among duplicates !

Thanks and Regards
Akiii
Posted by: Ras90it | Posted on: 01 Jun 2012 08:36:17 AM | Points: 10 | Alert Moderator 

Thank you very much
Posted by: Akiii | Posted on: 01 Jun 2012 08:37:32 AM | Points: 10 | Alert Moderator 

Its okay @Ras90it...



Thanks and Regards
Akiii
Posted by: Ras90it | Posted on: 01 Jun 2012 08:45:04 AM | Points: 10 | Alert Moderator 

I know OOPS concepts only. i want to learn DOTNET 4.0 with Full concepts like LINQ,AJAX, WPF, WCF etc... & SQL SERVER 2008 or 2012. please tel some idea. I need guidance.
Posted by: Akiii | Posted on: 01 Jun 2012 08:49:23 AM | Points: 10 | Alert Moderator 

Your question should be posted in a different category. But anyway, Have a good grip on OOPs because it is the base !

Try learning simple concepts first like ado.net...etc then go for linq, wcf, wpf...etc
these are advance concepts it will take time to have a grip on them.

Here you will find many articles, questions, blogs etc regarding concepts. Start reading them remember "There is no shortcut to anything. You learn by doing " !


Thanks and Regards
Akiii
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