mysql数据库基本存储单元
database -> tables -> column;
登录
mysql -u[username] -p[password]
退出
mysql> exit;
Database
显示所有数据库内所有database表
mysql> show databases; (sql语句后分号不能省略）创建database表
mysql> create database [database_name];进入并使用某个database表
mysql> use [database_name];显示当前database下所有tables;
mysql> show tables;删除数据库
mysql> drop database [database_name];
Table
查看数据库下某个table表下的内容
mysql> use [table_name];创建table表
mysql> create table [table_name] (
column_name column_type,
column_name column_type,
column_name column_type
);
Column
下面是对数据的一些操作
查看所有数据
mysql> select * from Customer;
(下面所有column的名称都暂定为Customer)插入数据
mysql> insert into Customer values("hxn","hxn","beijing","china",null,null);
(不插入数据时设置为null)删除数据
mysql> delete from Customer where First_Name="hxn";更新数据
mysql> update Customer set First_Name="hxn" where Last_Name="lhk";添加列
mysql>alter table Customer add [column_name] [data_type];删除列
mysql>alter table Customer drop [column_name] ;指定方式查询
select * from Customer where City like "h%";（以h开头）
select * from Customer where City like "%h"; (以h结尾)
select * from Customer where First_name="lhk" or Last_Name="hxn"; （or的使用）
select * from Customer where (First_Name > 100 or First_Name < 30) and City = null;（or与and连用）联表查询 join
select * from Customer2 join Customer where Customer.First_Name = Customer2.x;
