匯總其他記錄的功能

Question

假設我要獲取表T1所有記錄。 另外，我需要訪問記錄的min和max日期值。

我可以使用兩個查詢來做到這一點：

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

這是兩個單獨的查詢，但是可以將它們合並在一個查詢中嗎？
我的意思是所有記錄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