--S3为表名
SELECT *
  FROM S3 T1
 WHERE T1.B > = ALL (SELECT T2.B FROM S3 T2 WHERE T2.A = T1.A)
   AND T1.C >= ALL (SELECT T3.C
          FROM S3 T3
         WHERE T3.A = T1.A
           AND T3.B = T1.B)

------解决方案--------------------
select * from (
select a,b,c ,row_number()over(partition by a order by b desc,c desc) num1 from xxxx
) where num1=1


------解决方案--------------------
SQL code
WITH t AS(
SELECT 1 a,1 b,3 c FROM dual
UNION 
SELECT 1 ,2 ,1 FROM dual
UNION 
SELECT 1,2 ,2 FROM dual
UNION 
SELECT 2 ,1 ,1 FROM dual
UNION 
SELECT 2 ,2 ,1 FROM dual
)
SELECT DISTINCT a 
,Last_Value(b) over (PARTITION BY a ORDER BY b rows between unbounded preceding and unbounded following) b
,Last_Value(c) over (PARTITION BY a ORDER BY b,c rows between unbounded preceding and unbounded following) c
FROM t;