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sql999
Starting Member

8 Posts
Posted - 10/23/2012 :  23:38:47  Show Profile  Reply with Quote
here is the question

start-date end-date
2008-01-01 2008-11-21
2000-04-30 2001-10-10
2009-01-09 2009-10-19
.....
how to write the query to get the maximum date difference of the list
Thanks

visakh16
Very Important crosS Applying yaK Herder

India
47173 Posts
Posted - 10/24/2012 :  01:57:18  Show Profile  Reply with Quote 

SELECT TOP 1 WITH TIES *
FROM table
ORDER BY DATEDIFF(dd,Start_date,End_date) DESC


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SQL Server MVP
http://visakhm.blogspot.com/
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sql999
Starting Member

8 Posts
Posted - 10/24/2012 :  19:49:57  Show Profile  Reply with Quote
I tried it works,
seems order by asc/desc + top can replace max(), min()
thank you.
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visakh16
Very Important crosS Applying yaK Herder

India
47173 Posts
Posted - 10/25/2012 :  00:00:47  Show Profile  Reply with Quote
quote:
Originally posted by sql999

I tried it works,
seems order by asc/desc + top can replace max(), min()
thank you.

Not always. it depends on scenario

in cases you want max,min out of group you cant implement them using top and order by unless you use a subquery

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SQL Server MVP
http://visakhm.blogspot.com/
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sql999
Starting Member

8 Posts
Posted - 11/16/2012 :  00:58:27  Show Profile  Reply with Quote
thank for your help
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visakh16
Very Important crosS Applying yaK Herder

India
47173 Posts
Posted - 11/16/2012 :  22:24:31  Show Profile  Reply with Quote
welcome

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SQL Server MVP
http://visakhm.blogspot.com/
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