1.查看當前所有數據庫：show databases;

2.新建、刪除數據庫：create database qfdb；drop database qfdb;

3.使用某個數據庫:use qfdb;

4.創建視圖：create [or replace]view view_name[(column_list)] as select_statement

create view user_v(id,name,sex) as select id,name,sex from user;

5.查看創建視圖的元數據 show create view user_v;

6.修改視圖：alter view view_name[(column_list)]as select_statement

7.刪除視圖：drop view view_name

8.采用select語句將所選擇的行直接寫入到下個外部文件中去：select column_name into outfile filename

9.使用多條件進行多表查詢：select a.username,a.sex,b.salary from userinfo a,usersalary b where a.userid=b.userid and b.salary>2000

10.使用分組排序查詢：seletct a.sex,count(*) as count,avg(b.salary) from userinfo a,usersalary b where a.userid=b.userid and b.salary>2000 and b.salary<4000 group by a.sex