Merge in Oracle

MERGE INTO TBL_MenU b
USING (
  SELECT TRANNAME,TRANID
  FROM TBL_TRANS
   ) e
ON (b.MenuTEXT = e.TRANNAME)
WHEN MATCHED THEN
  UPDATE   SET b.MENUURL =   CONCAT( 'GuideMain.aspx?TransId=',     e.TRANID)