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
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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",
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