为了更好的展示
先建立一张表：作为测试使用
create database bigData;
use bigData;
CREATE TABLE dept(
id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
deptno MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,
dname VARCHAR(20)NOT NULL DEFAULT "",
loc VARCHAR(13) NOT NULL DEFAULT ""
)ENGINE=INNODB DEFAULT CHARSET=utf8;
CREATE TABLE emp(
id int unsigned primary key auto_increment,
empno mediumint unsigned not null default 0,
ename varchar(20) not null default "",
job varchar(9) not null default "",
mgr mediumint unsigned not null default 0,
hiredate date not null,
sal decimal(7,2) not null,
comm decimal(7,2) not null,
deptno mediumint unsigned not null default 0
)ENGINE=INNODB DEFAULT CHARSET=utf8;
create database bigData;
use
