swaping serial no with rollno in sql query

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SQL-Server-2005

hello all good moring

I have a problem to swaping roll no with serial No.
I have a Table like

id roll_No name
----------------------------------
1 1 raj
2 3 jogindar
3 6 yograj
4 7 amit
5 8 Upkar
6 10 hemraj
8 21 khemraj

and I want the result of like this
=======================================================

id roll_No aname
-----------------------------------
1 1 amit
4 2 amit
6 3 hemraj
2 4 jogindar
8 5 khemraj
5 6 Upkar
3 7 yograj

=-=============================
UPDATE Customer SET Name=Address , Address=Name
^
this query is working properly but

update tbl_testing set roll=(select row_number() over (order by aname))

this query is not usable

please help me its urgent

thanks in advance

Posted 10-Sep-13 18:05pm

Hem Raj Thakur

Updated 10-Sep-13 19:51pm

v6

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Comments

ArunRajendra 11-Sep-13 0:28am

do you want roll number assigned in alphabetical order. Right?

Hem Raj Thakur 11-Sep-13 0:31am

yes sir

[no name] 11-Sep-13 1:30am

why can't u use order by name..

2 solutions

Solution 2

Try this....
-- Same as OriginalGriff Solution but u have to add "PARTITION BY"

SQL

UPDATE MyTable SET RollNo=j.RowNo
FROM MyTable INNER JOIN
   (SELECT Id, ROW_NUMBER() OVER (PARTITION BY [Name] ORDER BY [Name]) AS RowNo FROM MyTable) as j
   ON MyTable.Id = j.Id

ROW_NUMBER (Transact-SQL)[^]
How to use ROW_NUMBER() to enumerate and partition records in SQL Server[^]

Regards,
GVPrabu

Posted 11-Sep-13 3:19am

gvprabu

Comments

Maciej Los 11-Sep-13 17:52pm

+5!

gvprabu 12-Sep-13 3:55am

thanks my frnd.... :-)

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OriginalGriff · Accepted Answer · 2013-09-10T20:55:00

Solution 1

This is a little complicated, but it's doable:

SQL

UPDATE MyTable SET RollNo=j.RowNo
FROM MyTable INNER JOIN
   (SELECT Id, ROW_NUMBER() OVER (ORDER BY [Name]) AS RowNo FROM MyTable) as j
   ON MyTable.Id = j.Id

When you

SQL

SELECT * FROM MyTable

after that, you will partly get what you want: The rows will not be ordered, but the Roll_no will be as you wanted.
To return them in the exact order you want, you need to specify a sort order - because SQL can return rows in any order convenient to it if you don't:

SQL

SELECT * FROM MyTable ORDER BY RollNo

Posted 10-Sep-13 20:55pm

OriginalGriff

Comments

Hem Raj Thakur 11-Sep-13 3:53am

thank you sir this query is helpfull to me.

OriginalGriff 11-Sep-13 4:19am

You're welcome!

Hem Raj Thakur 11-Sep-13 4:55am

sir one more question?
id roll_No aname class section
------------------------------------------
1 1 amit I A
4 2 amit I B
6 3 hemraj I A
2 4 jogindar I B
8 5 khemraj I B
5 6 Upkar I B
3 7 yograj I A
-----------------------------------------
I want to
id roll_No aname class section
------------------------------------------
1 1 amit I A
4 1 amit I B
6 2 hemraj I A
2 2 jogindar I B
8 3 khemraj I B
5 4 Upkar I B
3 3 yograj I A
----------------------------------------
please solve this thank you.