oracle sql查询表外键关系

SELECT F.TABLE_NAME, F.CONSTRAINT_NAME, F.COLUMN_NAME, F.POSITION, P.TABLE_NAME, P.COLUMN_NAME, P.POSITION  ,R.OWNER
  FROM USER_CONSTRAINTS R, USER_CONS_COLUMNS F, USER_CONS_COLUMNS P 
WHERE 1=1
   and R.OWNER = UPPER(‘ATS001‘) 
   AND R.TABLE_NAME = UPPER(‘ACCOUNTRELATIONS‘) 
   AND R.CONSTRAINT_TYPE = ‘R‘ 
   AND R.CONSTRAINT_NAME = F.CONSTRAINT_NAME 
   AND R.R_CONSTRAINT_NAME = P.CONSTRAINT_NAME 
   AND F.POSITION = P.POSITION 
ORDER BY F.TABLE_NAME, F.CONSTRAINT_NAME, F.POSITION;