MySQL DateTime 实例可以通过 UNIX_TIMESTAMP() 函数按以下方式转换为秒 -
mysql> Select UNIX_TIMESTAMP('2017-05-15 04:05:30') AS 'NUMBER OF SECONDS';
+-------------------+
| NUMBER OF SECONDS |
+-------------------+
| 1494801330 |
+-------------------+
1 row in set (0.00 sec)以上查询会将给定的日期时间实例转换为总秒数。
mysql> Select UNIX_TIMESTAMP(NOW()) AS 'NUMBER OF SECONDS'; +-------------------+ | NUMBER OF SECONDS | +-------------------+ | 1509248856 | +-------------------+ 1 row in set (0.00 sec)
以上查询会将当前的 DateTime 实例转换为总秒数。
mysql> Select UNIX_TIMESTAMP(Dateofreg) AS 'NUMBER OF SECONDS' from
testing where StudentName = 'Gaurav';
+-------------------+
| NUMBER OF SECONDS |
+-------------------+
| 1509247113 |
+-------------------+
1 row in set (0.00 sec)以上查询将转换 DateTime 实例，该实例是表“testing”中的存储值，其中列 StudentName 的值为“Gaurav”。
