- 排序
# 以Gid字段为基础进行降序排序
select * from student order by Gid desc
# 以Gid字段为基础进行升序排序
select * from student order by Gid asc
- 分组
# where Sid!=2:找出Sid不等于2的数据,
# group by Gid:然后以Gid字段为基础进行分组,每组只显示第一行数据
# having Sid > 10:如果某个组中的有Sid大于10,则把该组剔除
select * from student where Sid!=2 group by Gid having Sid > 10