mysql基本命令操作复习
show databases； 查看所有数据库
select database(); 查看当前数据库
use database_name; 切换数据库
show tables; 查看数据表
desceibe table_name; 查看表结构
create database database_name; 创建数据库
drop database database_name; 删除数据库
创建表
create table table_name(
id int auto_increment primary key,
name varchar(100),
email varchar(200)
...
);
drop table table_name; 删除表
增：insert into table_name(column1,column2, ...)
values(values1,values2...);插入数据
例子：insert into teacher (name,email) values ('kunge', '5418@qq.com');
查：select column1, column2 from table_name;
例子：select name,email from teacher;
查询所有列：select *from teacher;
改:update table_name
set column1=value1,column2=value2,...
where condition;
例子：update teacher set email = '541888@qq.com' where name = 'kenge';
删:delete from table_name where condit；
添加列：alter table table_name add column_name datatybe;
例子：alter table teacher add password varchar(200);