SQL & PL/SQL

I am using Oracle 10.2 and want to convert following SQLServer query to oracle:

WITH Factor (Code, StartDate, EndDate, Rate, Ranks, Factors) AS
(
	SELECT Code, StartDate, EndDate, Rate, Ranks, CONVERT(FLOAT, 1.0)
	FROM GSplitDateRangeRank
	WHERE Ranks = 1
	UNION ALL
	SELECT S.Code, S.StartDate, S.EndDate, S.Rate, S.Ranks, CASE WHEN S.Rate > 0 THEN F.Factors / S.Rate ELSE F.Factors END
	FROM GSplitDateRangeRank S
	JOIN Factor F
	ON S.Code = F.Code
	AND S.Ranks = F.Ranks + 1
)
SELECT * FROM Factor order by code

Following is the query converted in Oracle:

with Factor AS
(
	SELECT Code, StartDate, EndDate, Rate, Ranks, 1.0 Factors
	FROM GSplitDateRangeRank
	)
select Code, StartDate, EndDate, Rate, Ranks, CASE WHEN Rate > 0 THEN Factors / Rate ELSE Factors END Factors
from Factor 
start with ranks = 1 
connect by code = code
            and  ranks = prior ranks +1;

But the rows generated by Oracle query are lot more than those in MSSQL. Can any body kindly help me.