如何在 MySQL 中将日期时间转换为数字?
mysqlmysqli database
要在 MySQL 中将日期时间转换为数字，语法如下 −
SELECT UNIX_TIMESTAMP(yourColumnName) as anyVariableName FROM yourTableName;
为了理解上述语法，让我们创建一个表。创建表的查询如下 −
mysql> create table DateTimeToNumberDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> releasedDate datetime, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.46 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into DateTimeToNumberDemo(releasedDate) values(now());
Query OK, 1 row affected (0.19 sec)
mysql> insert into DateTimeToNumberDemo(releasedDate) values(curdate());
Query OK, 1 row affected (0.24 sec)
mysql> insert into
DateTimeToNumberDemo(releasedDate) values('1978-01-19');
Query OK, 1 row affected (0.55 sec)
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2016-09-13');
Query OK, 1 row affected (0.46 sec)
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2017-11-12');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2018-12-09');
Query OK, 1 row affected (0.21 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from DateTimeToNumberDemo;
以下是输出 −
+----+---------------------+ | Id | releasedDate | +----+---------------------+ | 1 | 2019-01-12 21:20:57 | | 2 | 2019-01-12 00:00:00 | | 3 | 1978-01-19 00:00:00 | | 4 | 2016-09-13 00:00:00 | | 5 | 2017-11-12 00:00:00 | | 6 | 2018-12-09 00:00:00 | +----+---------------------+ 6 rows in set (0.00 sec)
以下是将日期时间转换为数字的查询 −
mysql> select unix_timestamp(releasedDate) as DateToNumber from DateTimeToNumberDemo;
以下是输出 −
+--------------+ | DateToNumber | +--------------+ | 1547308257 | | 1547231400 | | 253996200 | | 1473705000 | | 1510425000 | | 1544293800 | +--------------+ 6 rows in set (0.00 sec)
