如何将sql限制中的AVG函数的小数位数设置为2？

Question

我想一般的小数限制在2 ..

SELECT grade.GStudNo, AVG(grade.Grade) AS Average, students.LName, students.FName, students.MName, students.Course 
FROM students INNER JOIN grade ON students.StudNo = grade.GStudNo 
WHERE GSem = '$sem' AND GYear = '$year' 
GROUP BY grade.GStudNo 
ORDER BY Average ASC LIMIT 3 

Answer 1

使用ROUND功能来包装AVG计算...

Answer 2

SELECT grade.GStudNo, ROUND(AVG(grade.Grade),2) AS Average, students.LName, students.FName, students.MName, students.Course 
FROM students INNER JOIN grade ON students.StudNo = grade.GStudNo 
WHERE GSem = '$sem' AND GYear = '$year' 
GROUP BY grade.GStudNo 
ORDER BY Average ASC LIMIT 3 

难道四舍五入到两个地方。