Hi Check the Following Example ....
CREATE TABLE dbo.Tab1 (Col1 VARCHAR(10), Col2 VARCHAR(10))
CREATE TABLE dbo.Tab2 (Col1 VARCHAR(10), Col2 VARCHAR(10))
INSERT INTO dbo.Tab1 (Col1, Col2)
SELECT 'Row1','A'
UNION ALL
SELECT 'Row2','A'
UNION ALL
SELECT 'Row3','A'
UNION ALL
SELECT 'Row4','A'
UNION ALL
SELECT 'Row5','A'
UNION ALL
SELECT 'Row6','A'
INSERT INTO dbo.Tab2 (Col1, Col2)
SELECT 'Row1','B'
UNION ALL
SELECT 'Row2','B'
UNION ALL
SELECT 'Row3','B'
SELECT T2.Col1,T2.Col2
FROM dbo.Tab2 T2
UNION
SELECT T1.Col1 , T1.Col2
FROM dbo.Tab1 T1
WHERE T1.Col1 IN (SELECT Col1 FROM dbo.Tab2)
It will helps u....