sql日期表达式
日期表达式返回当前系统日期和时间值：SQL> SELECT CURRENT_TIMESTAMP;
+---------------------+
| Current_Timestamp |
+---------------------+
| 2009-11-12 06:40:23 |
+---------------------+
1 row in set (0.00 sec)
另一个日期表达式如下所示：
SQL> SELECT GETDATE();;
+-------------------------+
| GETDATE |
+-------------------------+
| 2009-10-22 12:07:18.140 |
+-------------------------+
1 row in set (0.00 sec)
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