标签：admin ble utf8 sel varchar nbsp mys weight 修改字符集
1.SQL
创建数据库
mysql> create database db_users character set binary; mysql> create database db_college;
修改数据库
mysql> alter database db_users character set utf8;
删除数据库
mysql> drop database db_users;
| Java | MySQL |
| byte/short/int/long | tinyint/smallint/int/bigint |
| float/double | float/double |
| boolean | bit |
| char/String | char/varchar |
| Date | date/time/datetime/timestamp |
| File | blog/text |
创建表
mysql> create table t_student( -> id int primary key auto_increment, -> name nchar(30) not null, -> gender char(1), -> score double, -> state char(1) default 1, -> idcard int(18) unique -> );
修改表结构
增加列、修改列定义、修改列名称、删除列
mysql> alter table t_student add descStu varchar(150); mysql> alter table t_student modify descStu varchar(350); mysql> alter table t_student change descStu descption varchar(350); mysql> alter table t_student drop descption;
表的重命名、修改字符集
mysql> rename table t_student to t_stuItheima; mysql> alter table t_stuitheima character set utf8;
修改元组属性、删除元组
mysql> update user set password=password("admin") where host="::1" and user="root"; mysql> delete from user where user is null;
插入数据
mysql> insert into t_student values(null, "maqi",null,234.234,null,2342342); mysql> insert into t_student (id,name,gender,score,state,idcard) values(null, "maqi",null,234.234,null,2342342);
备库时，直接指定库名。还原数据时，如果把库都删除了，须另外创建。
C:\Users\Administrator\Desktop>mysqldump -uroot test > test.sql
mysql> source test.sql; C:\Users\Administrator\Desktop>mysqldump -uroot test < test.sql
中括号，表示输入、输出 重定向。
A
标签：admin ble utf8 sel varchar nbsp mys weight 修改字符集
原文地址：https://www.cnblogs.com/argor/p/9019650.html
