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CREATE TABLE #Table1 (datekey int, pointkey int, filter_key varchar(4), t_key int) ; INSERT INTO #Table1 (datekey,pointkey, filter_key, t_key) VALUES (5506061, 37, NULL, 1), (5506061, 37, NULL, 1), (5506061, 37, NULL, 1), (5506061, 37, NULL, 1), (5506061, 37, NULL, 1), (5506061, 37, NULL, 1), (5506763, 37, NULL, 2), (5506763, 37, NULL, 2), (5506763, 37, NULL, 2) ; ;with cte as ( SELECT datekey, pointkey, filter_key, CASE WHEN t_key = 1 AND Row_number()OVER(ORDER BY datekey,pointkey) = 1 THEN 1 ELSE 2 END AS new_filter_key, t_key FROM #Table1 ) update cte set filter_key = new_filter_key select * from #table1
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