标签:sql语句
数据库:
1、创建一个数据库:
create database dgf;
create database if not exists dgf;
2、查看创建的数据库是否成功:
show databases;
3、删除数据库:
drop database dgf;
数据表:
CREATE TABLE students(id TINYINT,Name CHAR(20) NOT NULL,Age TINYINT,Gender CHAR(1) NOT NULL);
查看库中的表: show tables from testdb;
查看表结构:desc students;
删除表:drop table students;
修改表; alter table students add course varchar(100);
修改字段用change,修改字段的属性用modify:
例如把course改成Course 并且放在name 的下边
alter table students change course Course varchar(100) after name;
往表中插入数据:
insert into students(Name,Gender) value (‘zhangsan‘,‘M‘),(‘xiaoming‘,‘F‘);
修改表中的数据update:
update students set id=1 where name=‘zhangsan‘;
删除表中的数据;
delete from students where name=‘zhangsan‘;
创建用户:
create user ‘dgf‘@‘%‘ identified by ‘123456‘;
删除用户:
drop user ‘dgf‘@‘%‘;
给用户修改密码:
mysql> set password for ‘root‘@‘localhost‘=password(‘123456‘);
#mysqladmin -uroot -p password ‘password‘
标签:sql语句
原文地址:http://qianyi.blog.51cto.com/9982879/1727130