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)
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