Here I will give a good SQL statement, it can delete the duplicate records and leave the min id record.
DELETE FROM student where id IN (
SELECT * FROM (
SELECT id FROM status WHERE (stuno, stuname) IN (
SELECT stuno,stuname FROM student GROUP BY stuno,stuname HAVING COUNT(1) > 1
) AND id NOT IN (
SELECT MIN(id) FROM student GROUP BY stuno,stuname HAVING COUNT(1) > 1
)
) AS stu_repeat_copy
);