PostgreSQL的：其他领域

Question

我想选择最新的（order by id desc）唯一对date_start, date_finish

CREATE TABLE some (
    id SERIAL, 
    date_start TIMESTAMP, 
    date_finish TIMESTAMP 
); 

Answer 1

选择唯一对顺序如何：

select date_start, date_finish 
from some 
group by date_start, date_finish 
order by max(id) desc