连接mysql数据库命令：mysql -u root -p
创建mysql数据库：create databaase xx库;
创建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)
);
----查看表结构
desc xx表名；
----查看版本号
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;
删除 delete from db_job where state=999;
查询 select * from db_job where state=398;
新增某一字段：alter table db_job add column name varchar(16)
修改某一字段名称：alter table db_job change 老字段名 新字段名 varchar(32); 新字段类型
修改某一字段值：update t8 set name="demo" where id=1;
删除某一字段：alter table db_job drop name;
修改表名：rename table 老表名 to 新表名;
修改库名：RENAME DATABASE db_name TO new_db_name
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