连接同一表中的行+oracle

我希望查询的输出提供以下信息：-

  I have a table MNO like this:-



 key    open  mode  close     time
   1    112    O             10:15pm
   1           C     200     11:50pm

---

我尝试了“选择键，nvlsumdecodemode，'O'，打开，0打开，nvlsumdecodemode，'C'，关闭，0关闭，nvlsumdecodemode，'C'，关闭，0-nvlsumdecodemode，'O'，打开，0按键与MNQ组的差异；”但是我不能按时分组了，谢谢你。成功了。谢谢你的团队。

key  open   close   difference  open_time   close_time
1    112     200      88         10:15pm      11:50pm

select
 o.key, o.open, c.close, 
 c.close - o.open as difference,
 o.time as open_time,
 c.time as close_time
from 
  mno o
  mno c
where
  o.key = c.key
and o.mode='O'
and c.mode='C'
;