1.查看当前系统日期
SQL> select to_char(sysdate, 'yyyy-mm-dd') from dual;
TO_CHAR(SYSDATE,'YYYY-MM-DD')
------------------------------
2021-11-29
mysql> select curdate();
+------------+
| curdate() |
+------------+
| 2021-11-29 |
+------------+
1 row in set (0.00 sec)
2.查看当前时间时间
SQL> select to_char(sysdate, 'hh24:mi:ss') from dual;
TO_CHAR(SYSDATE,'HH24:MI
------------------------
22:15:10
mysql> select current_time;
+--------------+
| current_time |
+--------------+
| 22:16:19 |
+--------------+
1 row in set (0.00 sec)
3.查询系统日期和时间：
SQL> select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;
TO_CHAR(SYSDATE,'YYYY-MM-DDHH24:MI:SS')
---------------------------------------------------------
2021-11-29 22:19:46
mysql> select now();
+---------------------+
| now() |
+---------------------+
| 2021-11-29 22:20:08 |
+---------------------+
1 row in set (0.00 sec)
mysql> select sysdate();
+---------------------+
| sysdate() |
+---------------------+
| 2021-11-29 22:20:17 |
+---------------------+
1 row in set (0.00 sec)
4.时间戳
SQL> select systimestamp from dual;
SYSTIMESTAMP
---------------------------------------------------------------------------
29-NOV-21 10.20.53.696960 PM +08:00
mysql> select current_timestamp;
+---------------------+
| current_timestamp |
+---------------------+
| 2021-11-29 22:21:27 |
+---------------------+
1 row in set (0.00 sec)
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MYSQL
