how to select the min value using having key word

Question

I have created the table stu_dep_det

CREATE TABLE  `stu_dept_cs` (
  `s_d_id` int(10) unsigned NOT NULL auto_increment,
  `stu_name` varchar(15) , `gender` varch         


        

Answer 1

SELECT t1.* FROM stu_dept_cs t1
LEFT JOIN stu_dept_cs t2
ON t1.avg > t2.avg
WHERE t2.stu_name IS NULL;

Answer 2

select somecolumn1,somecolumn2
from stu_dept_cs 
group by somecolumn1,somecolumn2,avg
having avg = min(avg)

or

with t1
(select rownumber() over (partition by somecolumn1,somecolumn2 
    order by somecolumn1,somecolumn2,avg asc) as rownum
from stu_dept_cs )
select * from t1 where rownum=1