mysql常用DDL命令

DDL主要負責數據庫的創/改/查/刪以及表格的創/改/查/刪

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1.創建數據庫:

create database [數據庫名] character set [字符編碼];

例如:

create database study1 character set utf8; 

2.查看數據庫:

show databases;

3.查看數據庫創建明細:

show create database [數據庫名字]; 

4.修改數據庫編碼:

alter database [數據庫名] character set [字符編碼];

5.刪除數據庫:

drop database [數據庫名];

6.使用數據庫:

use [數據庫名];

7.創建表格:

create table employee(id int,name varchar(20),sex char(2),birthday date,job varchar(50),salary double(7,2));

8.查看表的結構:

desc [表名];

9.在表中插入列:

alter table employee add address varchar(100);

10.修改列字符的屬性:

ALTER TABLE employee MODIFY job VARCHAR(20);

注:即將原來varchar(50)改為20;

11.刪除某列:

ALTER TABLE employee DROP address;

12.更改表名:

RENAME TABLE employee to user;

13.查看表的創建細節:

SHOW CREATE TABLE user;

14.修改字段名:

ALTER TABLE user CHANGE name username VARCHAR(10);

15.刪除表:

DROP TABLE user;