SELECT  t1.Field1,
        t1.Field2
FROM    @Test1 t1
        LEFT JOIN @Test2 t2 ON t1.Field1 = t2.Field1
                               AND t1.Field2 = t2.Field2
WHERE   t2.Field1 IS NULL;

DECLARE @Test1 TABLE (Field1 varchar(1), Field2 int);
INSERT INTO @Test1
SELECT 'A',1 UNION 
SELECT 'B',2 UNION
SELECT 'C',3 ;

DECLARE @Test2 TABLE (Field1 varchar(1), Field2 int);
INSERT INTO @Test2
SELECT 'B',2 UNION
SELECT 'C',3 ;

select * from @Test1 t1
where not exists(select 1 from @Test2 t2 where t1.Field1 = t2.Field1 and t1.Field2 = t2.Field2);

SELECT * FROM @Test1 t2 
WHERE NOT EXISTS (SELECT 1 FROM @Test2 t2 WHERE t1.Field1 = t2.Field1 AND t1.Field2 = t2.Field2)

We walk in the dark places no others will enter
We stand on the bridge and no one may pass