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當我們嘗試對表中存儲的日期值進行此類操作時，MySQL 會將日期值假設(shè)為數(shù)字并執(zhí)行算術(shù)運算。

假設(shè)我們有一個名為“example”的表在“orderdate”列中有一個日期值，然后進行算術(shù)運算將澄清上述內(nèi)容 –

mysql> select * from example;
+------------+
| orderdate  |
+------------+
| 2017-05-25 |
+------------+
1 row in set (0.00 sec)

mysql> select orderdate+10 from example;
+--------------+
| orderdate+10 |
+--------------+
|     20170535 |
+--------------+
1 row in set (0.00 sec)

mysql> select orderdate*10 from example;
+--------------+
| orderdate*10 |
+--------------+
|    201705250 |
+--------------+
1 row in set (0.00 sec)

mysql> select orderdate-10 from example;
+--------------+
| orderdate-10 |
+--------------+
|     20170515 |
+--------------+
1 row in set (0.00 sec)

mysql> select orderdate/10 from example;
+--------------+
| orderdate/10 |
+--------------+
|    2017052.5 |
+--------------+
1 row in set (0.00 sec)

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