Re inserting the values in one column

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I have the table structure as follows.

C#

sl.no     name        city
1          a           b
2          c           d
3          e           f
4          g           h

I have the above table. say i have totally 100 datas like that. Now in case lets consider i have deleted the 3rd row data. So the sl no will be like

C#

sl.no
1
2
4

Now what i want to do. I want the 3rd row sl no should be 3 irrespective of whatever the changes i make in the table. How can i accomplish this?

Posted 15-Sep-13 19:46pm

kparun86

Updated 15-Sep-13 19:55pm

Thanks7872

v2

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TrushnaK 16-Sep-13 1:54am

is your sl.no field is auot-increamented?

syed shanu 16-Sep-13 1:57am

Chk this .

SELECT ROW_NUMBER() OVER(ORDER BY sl.no asc) AS SNO,
name city
FROM yourtablename

kparun86 16-Sep-13 2:08am

OK will try that.

2 solutions

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OriginalGriff · Accepted Answer · 2013-09-15T19:58:00

Solution 1

This is a bad idea: if you are using an Identity field for your I'd! Then there could be other fields using this informally as a foreign key, so SQL does not reuse or reassign numbers.

Instead, return the rownumber

SELECT ROW_NUMBER() OVER (ORDER BY id) as RowNum, [name], city FROM MyTable

Posted 15-Sep-13 19:58pm

OriginalGriff

Comments

kparun86 16-Sep-13 2:09am

Ok fine. i have a huge database which is containing 60,000 datas. We may delete few datas and update few data. we have to maintain the continuity in the serial no column. Thats why i want to update like that.

OriginalGriff 16-Sep-13 4:27am

But that's the whole point - renumbering items doesn't "maintain the continuity" - it destroys it! It isn't good for database integrity either: suppose you have two people who each delete a different item. Who gets to update the records?
And think of it: you delete record 2 - you update 59,997 records, which is a non-trivial operation.

Thanks7872 · Accepted Answer · 2013-09-15T19:59:00

Solution 2

It won't makes sense as there are two possibilities.

1) If its an identity field than integrity matters.

2) If its not an identity field,than you have to update all the values. That is not a good idea.

I am still not clear why you want such approach.

Regards..:)

Posted 15-Sep-13 19:59pm

Thanks7872

v2

Comments

kparun86 16-Sep-13 2:09am

Ok fine. i have a huge database which is containing 60,000 datas. We may delete few datas and update few data. we have to maintain the continuity in the serial no column. Thats why i want to update like that.

Thanks7872 16-Sep-13 2:22am

That is what my point is.Why you want continuity? If its just for display purpose than you can handle it at the time of display. e.g. using datagrid to display records.

Dholakiya Ankit 16-Sep-13 2:28am

yes.agree

kparun86 16-Sep-13 2:28am

Continuity in the sense we want a total count of how many data's are there. thats why i wanted to update it like that.

Thanks7872 16-Sep-13 2:31am

Then count the rows in database.

kparun86 16-Sep-13 2:50am

ok fine. thanks