沿其他记录的聚合功能

Question

假设我要获取表T1的所有记录。此外，我需要访问记录的min和max日期值。

我可以使用两个查询来做到这一点：

select * from T1 ;
select min(created_at) as min_date,max(created_at) as max_date from T1;

这是两个单独的查询，但是可以将它们放在一个查询中吗？  我的意思是所有记录加上特定列的最小值和最大值。

Answer 1

select *,
       (select min(created_at) from T1) as min_date,
       (select max(created_at) from T1) as max_date
from T1;

Answer 2

SELECT * FROM `T1` JOIN (SELECT MIN(`created_at`) AS min_date,
MAX(`created_at`) AS max_date FROM `T1` ) AS temp