sele 班级,roun(avg(语文),2) 语均,roun(avg(数学),2) 数均,roun(avg(外语),2) 外均,roun(avg(综合),2) 综均 from cj grou by 班级 into dbf 班级均分 sele 班级,roun(avg(语文),2) 语均 from cj where 总分 betw 300 and 500 grou by 班级 into dbf 语均