mysql个人笔记

show databases;

use dbname;

show tables;

desc tablename;

create table new_table (

id varchar(12) primary not null default 0,

name varchar(20),

age int,

area varchar(10)

);

insert into new_table(

id,name,age,area)

values

('12345','jim',21,'beijing');

drop table new_table;

增删插()

alter table new_table add
sex ;

导出数据表文件》》 select new_table from jxc into outfile 'd:/t.xlsx;'

select new_table from jxc into outfile 'd:/t.txt;'

（ 解决乱码问题：select new_table from jxc into outfile 'd:/t.txt' CHARACTER SET gbk; OK）

使用查询结果创建表》》 首先说明MYSQL不支持：Select * Into new_table_name from old_table_name;

使用下面两个方法：

1、Create table new_table_name (Select * from old_table_name);

select * into new_table_name from old_table_name;

2、SELECT * INTO OUTFILE 'a.txt' FROM table_name;

LOAD DATA INFILE '/database/mysql/a.txt' INTO TABLE new_table_name;