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CREATE TABLE mytable ( ID int, rn_id int, NAME varchar(10) ); insert into mytable values ('001', 0 , NULL), ('001', 1 , 'Z'), ('001', 2 ,NULL), ('001', 3 , NULL), ('001', 4 ,'A'), ('001', 5 , NULL), ('001', 6 , NULL), ('001', 7 , 'B');
8 rows affected
with cte as ( SELECT ID, rn_id, NAME, SUM(IIF(NAME IS NULL, 0,1)) OVER (partition by ID ORDER BY rn_id ASC) AS grp FROM mytable ) select id, First_value(NAME) over ( partition by ID, grp order by rn_id) as NAME_ from cte
id
NAME_
1
null
1
Z
1
Z
1
Z
1
A
1
A
1
A
1
B