查询表中开始日期与结束日期

查询表中开始日期与结束日期

select startTime ,endTime from 
(
	select create_time as startTime, 1 as 'id' from 
	(	
	select DISTINCT(create_time) 
	from 	wifi_third_history_flow_information 
	ORDER BY UNIX_TIMESTAMP(create_time)  DESC limit 1
	) as temp 
) A 
join
(
select create_time as endTime, 1 as 'id' from 
	(	
	select DISTINCT(create_time) 
	from 	wifi_third_history_flow_information 
	ORDER BY UNIX_TIMESTAMP(create_time)  ASC limit 1
	) as temp 
) B
on A.id = B.id;
#方式二
select create_time from (
   select create_time from
       (
           select DISTINCT(create_time)
           from  wifi_third_history_flow_information
           ORDER BY UNIX_TIMESTAMP(create_time)  DESC limit 24
       ) as temp limit 1 )
as a
UNION
select create_time from (
   select create_time from
   (
       select DISTINCT(create_time)
       from  wifi_third_history_flow_information
       ORDER BY UNIX_TIMESTAMP(create_time)  ASC limit 24
   ) as temp  limit 1 )
as b