操作service表，查询os帐号的开通时间是最早的数据，下列sql语句正确的是：( )
select unix_host,os_username,create_date,min(create_date) from service
where create_date = (select min(create_date) from service);
select unix_host,os_username,create_date,min(create_date) from service
where create_date = min(create_date);
select unix_host,os_username,create_date from service
where create_date = min(create_date);
select unix_host,os_username,create_date from service
where create_date = (select min(create_date) from service);
