Home/ Questions/Q 8836463
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-14T09:30:02+00:00

I have three scenarios that i’d like to handle, with some remapping i’m doing.

  • 0

I have three scenarios that i’d like to handle, with some remapping i’m doing.

Scenario #1
I have Table A

Column A, Column B
1, NULL
2, NULL
3, NULL
4,
NULL
5, NULL
6, NULL

How Can I Update Column B such that I begin with the next value of Column A

Column A, Column B
1, 7
2, 8
3, 9
4, 10
5, 11
6, 12

Scenario #2
I have Table A

Column A, Column B
1, NULL
1, NULL
2, NULL
2,
NULL
3, NULL
3, NULL
3, NULL

How Can I Update Column B such that I begin with the next value of Column A but insuring I only update the values as a group like so

Column A, Column B
1, 4
1, 4
2, 5
2, 5
3, 6
3, 6
3, 6

Scenario #3
I have Table A that contains gaps in Column A

Column A, Column B
1, NULL
1, NULL
4, NULL
4,
NULL
6, NULL
6, NULL
6, NULL

How Can I Update Column B such that I begin with the next value of Column A but insuring I only update the values as a group like so

Column A, Column B
1, 7
1, 7
4, 8
4, 8
6, 9
6, 9
6, 9

Can I possibly handle all three of these scenario’s in one statement? If so, how?
Any help is much appreciated!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Try this:

    UPDATE t1
SET t1.ColumnB = t2.ColumnB
FROM @TableA t1
INNER JOIN 
(
   SELECT 
     ColumnA, 
     ColumnB = DENSE_RANK() OVER(ORDER BY ColumnA) 
               + 
               (SELECT MAX(columnA) FROM @tableA) 
   FROM @tableA
) t2 ON t1.ColumnA = t2.ColumnA;

    Here is the demos for the three scenarios:

    • 0