多项选择题

按照学生平均成绩(avg_grade)将students表中的数据检索出来,下面SQL语句正确的是()

A.SELECT*FROM students ORDERBYavg_grade
B.SELECT*FROM students GROUPBYavg_grade ASC
C.SELECT*FROM students ORDERBYavg_grade DESC
D.SELECT*FROM students ORDERbyavg_gradeasc