Question

Is there a straightforward query to fill in the gaps in a column with the next non-null value in that column? I want a column which has data like this:

--------------------
| ID | Version     |
--------------------
|  1 | '162.39'    |
--------------------
|  2 | NULL        |
--------------------
|  3 | NULL        |
--------------------
|  4 | '162.40'    |
--------------------
|  5 | '162.41'    |
--------------------
|  6 | NULL        |
--------------------
|  7 | NULL        |
--------------------
|  8 | '162.42'    |
--------------------
|  9 | '162.42'    |
--------------------
| 10 | NULL        |
--------------------

To end up like this

--------------------
| ID | Version     |
--------------------
|  1 | '162.39'    |
--------------------
|  2 | '162.40'    |
--------------------
|  3 | '162.40'    |
--------------------
|  4 | '162.40'    |
--------------------
|  5 | '162.41'    |
--------------------
|  6 | '162.42'    |
--------------------
|  7 | '162.42'    |
--------------------
|  8 | '162.42'    |
--------------------
|  9 | '162.42'    |
--------------------
| 10 | NULL        |
--------------------

The last value(s) can either be '162.42' or remain at NULL.

Answer 1

Try this:

UPDATE table t1 
SET Version = (
                 SELECT TOP 1 Version 
                 FROM table t2 
                 WHERE t2.id > t1.id 
                   AND Version IS NOT NULL 
                 ORDER BY t2.ID ASC
              )
WHERE t1.Version IS NULL

I didnt try it, maybe you will have to fix some details.