分页排序，分组过滤

• 排序

--升序 ASC 降序 DESC
order by ... ASC
order by ... DESC

• 分页

--limit 当前页，页面大小

SELECT s.`studentno`, studentName,SubjectName, StudentResult
FROM student s
INNER JOIN result r
ON s.`studentno`=r.`studentno`
INNER JOIN `subject` sub
ON sub.`subjectno`=r.`studentno`
WHERE SubjectName='Java程序设计-1' AND StudentResult>=20
ORDER BY StudentResult DESC
LIMIT 0,10

• 分组，过滤