Oracle11g 在内部查询中计算年龄，然后与值进行比较

我有两张桌子

fbuser（facebook\u ID，出生日期）-facebook\u ID是主键

墙（墙ID、脸书ID、公共视图）-脸书ID是外键

我想找到那些将墙设置为公共视图并且年龄超过24岁的用户

Select f.facebook_ID from fbuser f, wall w 
WHERE
  (w.public_view='y')
 AND
  (f.facebook_ID=w.facebook_ID)
 AND
  (select FLOOR( MONTHS_BETWEEN( CURRENT_DATE, f.date_of_birth ) / 12 ) 
  as person_age from fbuser where person_age >=24; 

SELECT
  f.facebook_ID
FROM fbuser f, wall w 
WHERE
  (f.facebook_ID=w.facebook_ID)
 AND
  (w.public_view='y')
 AND
  (  (MONTHS_BETWEEN( CURRENT_DATE, f.date_of_birth )/12)  >=24);