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 Querying a query results??
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tlongarms
Starting Member

1 Posts

Posted - 03/14/2013 :  20:19:19  Show Profile  Reply with Quote
HI,

I am quite new to SQL and and have looked at many examples but have no idea how to make my query work. I ran the following query:

SELECT name, (SELECT population/area) AS density
FROM country


which listed all my country's and their population density (which was population divided by area). However I want to run a query on the results that I got here to give me just one row that will return the country with the MAX density. Is this possible, if so can you tell me how as everything I try and do just wont work?

Thanks for any help!

Terry

James K
Flowing Fount of Yak Knowledge

3873 Posts

Posted - 03/14/2013 :  20:58:13  Show Profile  Reply with Quote
Couple of different ways to get the highest density:
select TOP (1) with ties name, 1.0*population/area as density
from country
order by density desc 


;with cte as
(
	select name, 1.0*population/area as density,
	RANK() over(order by 1.0*population/area desc) as RNK
	from country
)
select name, density from cte where RNK = 1;
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