mysql笔记

1.datetime
时区转换：convert_tz(dt,from_tz,to_tz)
SELECT convert_tz(utc_timestamp(), '+00:00', '+08:00') 得到当前东八区时间
时间格式化
date_format(operation_time,'%Y-%m-%d %H:%i')
SELECT date_format(convert_tz(utc_timestamp(), '+00:00', '+08:00'),"%y-%m-%d %h:%i:%s")
17-08-24 05:39:41
SELECT date_format(convert_tz(utc_timestamp(), '+00:00', '+08:00'),"%Y-%m-%d %h:%i:%s")
2017-08-24 05:40:15

2.ENUM
建表EMPLOYEE，字段TYPE为ENUM类型
CREATE TABLE `EMPLOYEE` (
  `FIRST_NAME` char(20) NOT NULL,
  `LAST_NAME` char(20) DEFAULT NULL,
  `AGE` int(11) DEFAULT NULL,
  `SEX` char(1) DEFAULT NULL,
  `INCOME` float DEFAULT NULL,
  `TYPE` enum('GOOD','BAD') NOT NULL DEFAULT 'GOOD',
  PRIMARY KEY (`FIRST_NAME`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;