Avg Group By 按班级统计平均分
摘要：
AVG sql command is used to find out average value of a numeric field in a table. Now let us apply this AVG command to this table and find out the average mark obtain by all the students. The AVG com... 阅读全文
posted @ 2009-01-17 16:55 cy163 阅读(5024) 评论(1) 推荐(0) 编辑
