如何比较MySQL中的时间戳?
要比较MySQL中的时间戳,可以使用DATE()
。让我们首先创建一个表-
mysql> create table comparingTimestampDemo-> (
-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> AdmissionDate timestamp
-> );
以下是使用insert命令在表中插入记录的查询-
mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-03-31');mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-10');
mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-15');
mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-03-29');
mysql> insert into comparingTimestampDemo(AdmissionDate) values('2019-04-07');
以下是使用select语句显示表中所有记录的查询-
mysql> select * from comparingTimestampDemo;
这将产生以下输出-
+----+---------------------+| Id | AdmissionDate |
+----+---------------------+
| 1 | 2019-03-31 00:00:00 |
| 2 | 2019-04-10 00:00:00 |
| 3 | 2019-04-15 00:00:00 |
| 4 | 2019-03-29 00:00:00 |
| 5 | 2019-04-07 00:00:00 |
+----+---------------------+
5 rows in set (0.00 sec)
现在让我们比较MySQL中的时间戳-
mysql> SELECT DATE(`AdmissionDate`) FROM comparingTimestampDemo WHEREDATE(`AdmissionDate`) < CURDATE() - INTERVAL 3 DAY;
这将产生以下输出-
+-----------------------+| DATE(`AdmissionDate`) |
+-----------------------+
| 2019-03-31 |
| 2019-03-29 |
+-----------------------+
2 rows in set (0.00 sec)
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