How can I fill the blank space in the example below?

Question

I have to fill using sql statement the blank space with the same description that appears below that belong to the same STTCKT. I
am using a temporary table.

Answer 1

There is no need in ROW_NUMBER. You can use simple query like below sample which cost 6% relative to the use of ROW_NUMBER which cost 94% (sort is havy operation with no index).
DDL+DML:
CREATE TABLE test( [STBK#] varchar(50), STTCKT int)
truncate table test
Insert into test values
(null, 48035)
,('First Two Truck', 48035)
,(null, 48039)
,('First Two Truck', 48039)
,(null, 48046)
,('First Two Truck', 48046)
,(null, 48054)
,('KLS LOGISTIC, INC.', 48054)
GO
select * from test
GO
If all you need is SELECT with FILL then check this:
select
--[STBK#] ,
STTCKT, [Fixed_STBK#]
from test T1
Cross APPLY (SELECT TOP 1 T.[STBK#] FROM test T WHERE T.STTCKT = T1.STTCKT and T.STBK# IS NOT NULL) T2 ([Fixed_STBK#])
And you can use this query as well without CROSS APPLY
select
--T1.[STBK#] ,
T1.STTCKT, T2.[Fixed_STBK#]
from test T1
LEFT JOIN (SELECT T.STTCKT,MAX(T.[STBK#]) [Fixed_STBK#] FROM test T GROUP BY T.STTCKT) T2 ON T1.STTCKT = T2.STTCKT
If you are looking for update the original table please check this:
UPDATE test
SET [STBK#] = T2.[Fixed_STBK#]
FROM test T1
Cross APPLY (SELECT TOP 1 T.[STBK#] FROM test T WHERE T.STTCKT = T1.STTCKT and T.[STBK#] IS NOT NULL) T2 ([Fixed_STBK#])
WHERE T1.[STBK#] IS NULL
GO
I hope this is helpful and answer your need, If not please try to clrify your needs and post your DDL+DML
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