獲取包含一列的兩個最高值的所有行

Question

示例表看起來是這樣的：

last_update | notes 
-------------+-------------------- 
1449619200 | not that important 
1449619200 | rather useless 
1449705600 | interesting 
1449792000 | very important 
1449792000 | very useful 

現在我想有一個SQLite命令輸出與兩個最新更新時間戳的所有行（即1449705600和1449792000），以便輸出表如下所示：

last_update | notes 
-------------+-------------------- 
1449705600 | interesting 
1449792000 | very important 
1449792000 | very useful 

該命令應該是什麼樣子？

Answer 1

select * from yourtable 
where last_update in (select distinct last_update 
         from yourtable 
         order by last_update desc 
         limit 2)