汇总其他记录的功能

Question

Let's say I am going to fetch all records of table T1 . Also, I need to have access to min and max date value of records.

I may do that using two queries:

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

This is two separate queries , but is it possible to have them in one query?
I mean all records plus min and max value of a specific column.

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