第一种方法：select current_date；

mysql> select current_date as Systemtime;
+------------+
| Systemtime |
+------------+
| 2009-07-29 |
+------------+

第二种方法：select now()

mysql> select now() as Systemtime;
+---------------------+
| Systemtime          |
+---------------------+
| 2009-07-29 19:06:07 |
+---------------------+

第三种方法：select sysdate()

mysql> select sysdate() as Systemtime;
+---------------------+
| Systemtime          |
+---------------------+
| 2009-07-29 19:06:45 |
+---------------------+