创建客户表customers

创建客户表customers
客户表包含的数据有customer_id,name,gender,registration_date,nickname,email

CREATE TABLE `customers` (
  `customer_id` varchar(11) NOT NULL COMMENT '客户编号',
  `name` varchar(20) COMMENT '姓名',
  `gender` char(1) COMMENT '性别',
  `registration_date` date COMMENT '注册日期',
  `nickname` varchar(20) COMMENT '昵称',
  `email` varchar(30) COMMENT '邮箱',
  PRIMARY KEY (`customer_id`)
);