mysql经常使用的命令

如何登陆数据库

飞机着陆

mysql -u <username> -p

访问本机数据库

mysql -u <username> -D <database_name> -p

登陆远程某个数据库

mysql -h <hostname> -u <username> -D <database_name> -p

登陆远程某个数据库,从特定port

mysql -h <hostname> -P <port> -u <username> -D <database_name> -p

怎样运行sql脚本

mysql > source <scriptname.sql>

怎样參看有哪些库

show databases

怎样切换数据库

use <database_name>

怎样參看库中有哪些表

show tables

怎样查看正在使用哪个数据库

status

查看数据状态，參数

show status

改动mysqlpassword

mysqladmin -u root -p password {new_password}

同意mysql远程连接

update user set host = '%' where user = 'root';

查询表定义

show create table {table_name};

show columns from {table_name};

describe {table_name};

创建数据库

create database {databas_name}

删除数据库

drop database {databas_name}

新建表

create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)

create table table1(

-> col1 int primary key,

-> col2 int,

-> col3 varchar(30),

-> )

-> ;

create table Teacther

(

tNo int primary key,

tName varchar(50) not null,

tSex varchar(2) not null check (tsex in ('男','女')),

tBirthDate datetime not null,

tSalary decimal(18,2),

tHairDate datetime,

depNo int

foreign key(depNo) references Depart(depNo)

)

依据已有的表创建新表

create table {new_table_name} like {old_table_name}

create table {new_table_name} as select {[col1_name],[col2_name}, …} from {old_table_name} definition only

插入数据

insert into {table_name} (field1,field2) values(value1,value2);

insert into table1 (col1,col2,col3) values(1,1,"aaa");

更新数据

update {table_name} set {field1}={value1} where {condition};

update table1 set col3="zzz" where col1=1;

查询数据

select {field1,field2} from {table_name} where {condition};

select * from table1;

select distinct {column} from {table_name} 显示唯一值

select {column} from {table_name} limit {num} 限制检索的行数

select {column} from {table_name} limit {num1, num2} 从第num1開始的num2个行

select {column} from {table_name} order by {column} desc; 按降序排列

select {column} from {table_name} where {column} between {num1} and {num2} 范围查找

select {column} from {table_name} where {column} is null 查找空值

select from where group by having order by limit

删除数据

delete from {table_name} where {condition};

delete from table1 where col1=2;