如何在MySQL中将DateTime转换为数字？
要将日期时间转换为MySQL中的数字，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) -> );
使用insert命令在表中插入一些记录。查询如下-
mysql> insert into DateTimeToNumberDemo(releasedDate) values(now());
mysql> insert into DateTimeToNumberDemo(releasedDate) values(curdate());
mysql> insert into
DateTimeToNumberDemo(releasedDate) values('1978-01-19');
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2016-09-13');
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2017-11-12');
mysql> insert into DateTimeToNumberDemo(releasedDate) values('2018-12-09');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)