- 排序
# 以Gid字段爲基礎進行降序排序
select * from student order by Gid desc
# 以Gid字段爲基礎進行升序排序
select * from student order by Gid asc
- 分組
# where Sid!=2:找出Sid不等於2的數據,
# group by Gid:然後以Gid字段爲基礎進行分組,每組只顯示第一行數據
# having Sid > 10:如果某個組中的有Sid大於10,則把該組剔除
select * from student where Sid!=2 group by Gid having Sid > 10