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MySQL一招入門

roo col 查詢 int end data 入門 字段類型 not

連接mysql數據庫命令:mysql -u root -p

創建mysql數據庫:create databaase xx庫;

創建mysql表:

create table db_xx表(

  id int primary key auto_increment,

  name varchar(64) not null,

  address varchar(16) not null,

  salary decimal(9,2),

  createtime

  ----建表操作

  create table db_Job(
  id int primary key auto_increment,
  createtime datetime DEFAULT CURRENT_TIMESTAMP,
  updatetime datetime default null,

  startime timestamp NOT NULL default CURRENT_TIMESTAMP,

  endtime datetime default NULL

  state int(10)
  );

  ----查看表結構

  desc xx表名;

  ----查看版本號

  新增 insert into xx表(字段1,字段2....)values(‘值1‘ , ‘值2‘,....)

  修改 update db_job set state=‘999‘ where id=1;

  刪除 delete from db_job where state=999;

  查詢 select * from db_job where state=398;

  新增某一字段:alter table db_job add column name varchar(16)

  修改某一字段名稱:alter table db_job change 老字段名 新字段名 varchar(32); 新字段類型

  修改某一字段值:update t8 set name="demo" where id=1;

  刪除某一字段:alter table db_job drop name;

  修改表名:rename table 老表名 to 新表名;

  修改庫名:RENAME DATABASE db_name TO new_db_name

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MySQL一招入門