Question

Hi I want to add/assign value to row which are null with previous row value in SQL Server 2005

Example:

Col1  Col2 
1      45
NULL   30
2      20
3      40
NULL   30
NULL   20
4      40

Output must be like this

Col1  Col2 
1      45
1      30
2      20
3      40
3      30
3      20
4      40

Answer 1

I Assume that you have a column named id which is a primary key, or your default order is made by this field, and I assume that your table’s name is t1.

here is the query which gives the result you need:

SELECT * FROM T1
WHERE col1 IS NOT NULL
UNION ALL 
SELECT a.id, nested.col1, a.col2 FROM t1 as a 
    CROSS APPLY 
        (SELECT TOP 1 * FROM t1 as b WHERE a.id > b.id and b.col1 IS NOT NULL ORDER BY b.id DESC) nested
WHERE a.col1 IS NULL
ORDER BY id