select C.Description,s.Description
from category C
inner join SubCategory S on C.CategoryID =S.CategoryID
where  C.IsActive=1 and S.IsActive=1

DROP TABLE IF EXISTS #temp
CREATE TABLE #temp ( Description VARCHAR(100), SubDescription VARCHAR(100));

INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment', 'Peds' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment', 'Peds2' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment', 'Peds3' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment', 'Peds4' );

INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment1', 'Peds' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment1', 'Peds2' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment1', 'Peds3' );
INSERT INTO #temp ( Description, SubDescription )VALUES ( 'Patient Assignment1', 'Peds4' );

WITH Temp
AS (
    SELECT
        Description,
        SubDescription,
        ROW_NUMBER() OVER ( PARTITION BY Description
ORDER BY Description ) rownumber
    FROM #Temp
)
SELECT
    CASE WHEN Temp.rownumber = 1 THEN Description ELSE '' END Description,
    SubDescription
FROM Temp;

select C.Description,s.Description
from category C
inner join SubCategory S on C.CategoryID =S.CategoryID
where  C.IsActive=1 and S.IsActive=1