Select Case Statement in sql 2008 Table A record is null (ex. name) then select from b

DECLARE @A TABLE (ID INT IDENTITY(1,1),NAME VARCHAR(20))
DECLARE @B TABLE (ID INT IDENTITY(1,1),NAME VARCHAR(20))

INSERT INTO @A VALUES('A TEJAS')
INSERT INTO @A VALUES('A JAYESH')
INSERT INTO @A VALUES(null)

INSERT INTO @B VALUES('B TEJAS')
INSERT INTO @B VALUES('B JAYESH')
INSERT INTO @B VALUES('B KRUNAL')

SELECT * FROM @A

SELECT CASE WHEN A.NAME IS NULL THEN B.NAME ELSE A.NAME END AS NAME FROM @A AS A
INNER JOIN @B AS B ON A.ID = B.ID


--Out Put like this..

--simple select query output

ID          NAME
----------- --------------------
1           A TEJAS
2           A JAYESH
3           NULL


--case when select query output

NAME
--------------------
A TEJAS
A JAYESH
B KRUNAL

SELECT ISNULL(A.NAME,B.NAME)