•delete from club where; 删除id=001的俱乐部信息
•select * from club where id between "1" and "3"; 查询出id=1到3的条目
•select * from club where id in("1","3","4"); 查询id=1,3,4的条目
•select * from club where name like "M%r"; 通配符%表示任意长度的字符（可以是0，汉字为两个字符）
•select * from club where id in("1","3","4") and mark>50; 多重查询
update语句

•select count(distinct mark) from club; 不同分数的有多少条记录

•select count(*) from club; 查询club中有多少条记录
•select max(mark) from club; 最高积分
•select club_name from club where mark not between 48 and 50; 查询mark不在48与50之间的club
•select * from club where name like "M_r"; _表示单个字符
•select club_name from club where mark>50; 查询出mark大于50的club
•select * from club order by mark desc; 按照mark降序排列（desc：降序，usc：升序）

•select * from coffee where; 查询出id=1的所有信息
•show create table coffee; 查看表信息，包括建表语句
•show columns from coffee; 查看表结构
数量查询相关

•select sum(mark) from club; 积分总和
•select * from club where id not in("1","3","4");
delete语句

•show database; 显示出现有的数据库
•alter table ss drop mark; 删除表ss中mark列
•alter table student rename ss; 改变表名
•select * from club where or; 查询出id=1和id=3这两个条目
•alter table coffee add taste varchar(10); 增加新的一列

•update club set mark=mark-8 where; id=1的俱乐部积分罚8分
•insert into coffee (id,coffee_name,taste,rank) value ("1","BlueMountain"，“well”，“5”); 插入数据
•select min(mark) from club; 最低积分
以上语句都是SQL语句增删改查最基本的部分，属于入门级别，一定要掌握。

select语句

•select avg(mark) from club; 平均积分
•use database_x; 现在要使用数据库database_x
•select coffee_name from coffee where; 查询出id=2的coffee name
•create table coffee (id int(5) not null,coffee_name varchar(25)); 创建一张表，包含id和coffee_name两个字段