mysql常见命令？

查看多少库存在？

show databases;

建库：

create database yintao;

 

查看 

show databases;

 

使用库

use yintao;

 

建表

create table students(

    id int unsigned not null auto_increment primary key,

    name char(8) not null,

    sex char(4) not null,

    age tinyint unsigned not null,

    tel char(13) null default "-"

);

 

查看

show tables;

desc students;

 

增 insert

insert [into] 表名 [(列名1, 列名2, 列名3, ...)] values (值1, 值2, 值3, ...);

insert into students values(NULL, "王刚", "男", 20, "13811371377");

insert into students (name, sex, age) values("孙丽华", "女", 21);

 

删 delete

delete from 表名称 where 删除条件;

delete from students;

delete from students where id=2;

delete from students where age<20;

 

改 update

update 表名称 set 列名称=新值 where 更新条件;

update students set tel=default where id=5;

update students set age=age+1;

update students set name="张伟鹏", age=19 where tel="13288097888";

 

查 select

select 列名称 from 表名称 [查询条件];

select name, age from students;

select * from students;

 

select * from students where age > 21;

select * from students where name like "%王%";

select * from students where id<5 and age>20;