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;