Use sql function in condition

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i wanna executed this code

SQL

SELECT *, RANK() OVER (ORDER BY td.NameRss)as myrank FROM tblData td
left join tblRss tr on td.NameRss=tr.RssAdress
where td.myrank <=10

But i have error

Msg 207, Level 16, State 1, Line 5
Invalid column name 'myrank'.

Sql server 2008 R2

how can i solve this problem ?

Posted 22-Apr-13 10:45am

aref.bozorgmehr

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db7uk · Accepted Answer · 2013-04-22T10:53:00

Solution 1

You cant do that. You need to create a subquery, temp table or CTE. Please see below:

SQL

;WITH CTE
AS
(
	SELECT *, RANK() OVER (ORDER BY td.NameRss) as myrank FROM tblData td
	left join tblRss tr on td.NameRss=tr.RssAdress
)
Select *
FROM CTE
where CTE.myrank <=10

OR

SQL

select *
from 
(
	SELECT *, RANK() OVER (ORDER BY td.NameRss) as myrank FROM tblData td
	left join tblRss tr on td.NameRss=tr.RssAdress
) t
where t.myrank <=10

Posted 22-Apr-13 10:53am

db7uk

Comments

aref.bozorgmehr 22-Apr-13 17:23pm

yes it's ok Thanks
i want to get just ten row of each rank
what can i to do?

db7uk 22-Apr-13 17:26pm

You will need to use Partition by. http://msdn.microsoft.com/en-GB/library/ms176102.aspx
Play around with RANK and DENSE_RANK