Mysql—数据类型详解

在MySQL中常用数据类型主要分为以下几类：数值类型、字符串类型、日期时间类型。

数值类型

字符串类型

日期时间类型

数据类型	字节数	取值范围	格式	备注
year	1	1901~2155	yyyy	存储年
date	3	1000-01-01~9999-12-31	yyyy-MM-dd	存储日期值
time	3	-838:59:59~838:59:59	HH:mm:ss	存储时间值(时分秒)
datetime	8	1000-01-01 00:00:00~9999-12-31 23:59:59	yyyy-MM-dd HH:mm:ss	存储日期+时间
timestamp	4	1970-01-01 08:00:01~2038-01-19 11:14:07	yyyy-MM-dd HH:mm:ss	存储日期+时间，可作时间戳

drop table if exists test_time;
create table test_time(
    year_value year,
    date_value date,
    time_value time,
    datetime_value datetime,
    timestamp_value timestamp
)engine=innodb default charset=utf8 comment="测试时间表";

mysql> insert into test_time values(now(), now(), now(), now(), now());
mysql> insert into test_time values(2019,20190910,160628,20190910160636,null);

create_time datetime default current_timestamp,
update_time datetime default current_timestamp on update current_timestamp,
create_time timestamp default current_timestamp comment "创建时间",
update_time timestamp default current_timestamp on update current_timestamp comment "修改时间",

http://c.biancheng.net/view/2421.html

https://www.cnblogs.com/xrq730/p/8446246.html

https://www.cnblogs.com/-xlp/p/8617760.html

https://blog.csdn.net/csdnzhang365/article/details/80591987

https://www.cnblogs.com/qq631243523/p/9791393.html

https://blog.csdn.net/yuzhiqiang_1993/article/details/81453569

https://www.runoob.com/mysql/mysql-data-types.html

https://blog.csdn.net/world_zheng/article/details/82941726