如何在MySQL的时间戳字段中搜索日期？

您可以使用MySQL的DATE（）函数来实现此功能。首先让我们创建一个表 −

mysql> create table DemoTable
(
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentAdmissionDate timestamp
);
Query OK, 0 rows affected (0.63 sec)

使用插入命令将一些记录插入表中 −

mysql> insert into DemoTable(StudentAdmissionDate) values('2011-01-12 12:34:43');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentAdmissionDate) values('2012-10-23 11:32:21');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentAdmissionDate) values('2001-02-14 05:12:01');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(StudentAdmissionDate) values('2018-12-31 15:10:04');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(StudentAdmissionDate) values('2019-04-16 11:04:10');
Query OK, 1 row affected (0.81 sec)

以下是使用select语句从表中显示所有记录的查询语句 −

mysql> select *from DemoTable;

这将产生以下输出 –

+-----------+----------------------+
| StudentId | StudentAdmissionDate |
+-----------+----------------------+
| 1         | 2011-01-12 12:34:43  |
| 2         | 2012-10-23 11:32:21  |
| 3         | 2001-02-14 05:12:01  |
| 4         | 2018-12-31 15:10:04  |
| 5         | 2019-04-16 11:04:10  |
+-----------+----------------------+
5 rows in set (0.00 sec)

以下是在时间戳字段中搜索日期的查询语句。

mysql> select *from DemoTable where date(StudentAdmissionDate)='2001-02-14';

这将产生以下输出 –

+-----------+----------------------+
| StudentId | StudentAdmissionDate |
+-----------+----------------------+
| 3         | 2001-02-14 05:12:01  |
+-----------+----------------------+
1 row in set (0.04 sec)

我们还可以搜索给定范围之间的日期:

mysql> select *from DemoTable where StudentAdmissionDate >='2012-01-01' and StudentAdmissionDate < '2019-12-01';

这将产生以下输出 –

+-----------+----------------------+
| StudentId | StudentAdmissionDate |
+-----------+----------------------+
| 2         | 2012-10-23 11:32:21  |
| 4         | 2018-12-31 15:10:04  |
| 5         | 2019-04-16 11:04:10  |
+-----------+----------------------+
3 rows in set (0.00 sec)

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