从带有日期记录的一列中显示 MySQL 中的不同日期


我们首先创建一个表——

mysql> create table DemoTable
(
   AdmissionDate datetime
);
Query OK, 0 rows affected (8.99 sec)

使用插入命令在表中插入一些记录——

mysql> insert into DemoTable values('2010-01-10 12:30:45');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('2010-01-10 12:30:45');
Query OK, 1 row affected (0.46 sec)
mysql> insert into DemoTable values('2010-01-10 12:30:45');
Query OK, 1 row affected (0.71 sec)
mysql> insert into DemoTable values('2010-01-12 12:30:45');
Query OK, 1 row affected (1.22 sec)
mysql> insert into DemoTable values('2010-01-20 12:30:45');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('2010-01-20 12:30:45');
Query OK, 1 row affected (0.51 sec)

使用选择语句从表中显示所有记录——

mysql> select *from DemoTable;

这将生成以下输出——

+---------------------+
| AdmissionDate       |
+---------------------+
| 2010-01-10 12:30:45 |
| 2010-01-10 12:30:45 |
| 2010-01-10 12:30:45 |
| 2010-01-12 12:30:45 |
| 2010-01-20 12:30:45 |
| 2010-01-20 12:30:45 |
+---------------------+
6 rows in set (0.00 sec)

以下是显示不同日期的查询——

mysql> select distinct AdmissionDate from DemoTable;

这将生成以下输出——

+---------------------+
| AdmissionDate       |
+---------------------+
| 2010-01-10 12:30:45 |
| 2010-01-12 12:30:45 |
| 2010-01-20 12:30:45 |
+---------------------+
3 rows in set (0.00 sec)

更新日期: 30-Sep-2019

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