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how to group by in subquery Expand / Collapse
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Posted Tuesday, June 18, 2013 6:05 AM
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I have a scenario where i have a message table, which is like this

MessageId int  primary key
token text
hash nvarchar(50)
subject text
name text


There is a tendency for messages to be duplicated, but the hash will be unique for such messages.

Now I page the table based on some sorting, and using standard sql server paging query.

select * from (select ROW_NUMBER() over (order by name ASC) as RI, * from MessageTable where token = '1')  as SUB WHERE SUB.RI >= 50 AND SUB.RI <= 100


What I want to do now is that I want to choose unqiue hash messagetable rows and then do the above operation on it.
SELECT *
FROM MessageTable
GROUP BY Hash


I can't seem to get this using subquery, can somebody suggest a way for that?

Thanks,
Roger
Post #1464601
Posted Tuesday, June 18, 2013 8:34 AM


SSChampion

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Group: General Forum Members
Last Login: Yesterday @ 2:24 PM
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Hi and welcome to the forums. In order to help we will need a few things:

1. Sample DDL in the form of CREATE TABLE statements
2. Sample data in the form of INSERT INTO statements
3. Expected results based on the sample data

Please take a few minutes and read the first article in my signature for best practices when posting questions.

Also, you seem to be using the text datatype. This type is deprecated and is horrible for performance. You should change to varchar(max) instead. Given the columns (subject, name and token) I doubt you need more than varchar(50) or so.


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