sql - How can I retrieve an entire row of a MAX query?

Question

Im currently using this query in attempts to retrieve the highlighted rows

"Select max(grades_id) from grades WHERE dt_year BETWEEN 2012 AND 2013 GROUP BY student_id HAVING count(grades_id) >= 2"

however it is only yielding

is there any way to retrieve the entire row as opposed to just the grades_id?

Answer 1

只需将现有查询用作子查询来确定所需的行，然后为它们选择所有列，如下所示：

select * from grades where grades_id in (Select max(grades_id) from grades WHERE dt_year BETWEEN 2012 AND 2013 GROUP BY student_id HAVING count(grades_id) >= 2)

Answer 2

询问：

SELECT g.*
FROM grades g
WHERE g.grades_id = (SELECT MAX(g1.grades_id)
                     FROM grades g1
                     WHERE g1.dt_year BETWEEN 2012 AND 2013
                     AND g1.student_id = g.student_id
                     HAVING count(g1.grades_id) >= 2)

如果您可以在http://sqlfiddle.com/中插入数据，也许我可以给出更优化的解决方案。