如何在 MySQL 中将算术运算符（+、-、*、/）与 INTERVAL 关键字的单位值一起使用？

我们可以将算术运算符（+、-、*、/）与 INTERVAL 关键字的单位值一起使用，如下 -

mysql> Select date('2017-10-22' + INTERVAL 2+2 Year) AS 'Date After (2+2)Years'; +------------------------+ | Date After (2+2) Years | +------------------------+ | 2021-10-22 | +------------------------+ 1 row in set (0.00 sec)

使用减法 (-)

mysql> Select date('2017-10-22' + INTERVAL 2-2 Year) AS 'Date After (2-2)Years';
+------------------------+
| Date After (2-2) Years |
+------------------------+
| 2017-10-22             |
+------------------------+
1 row in set (0.00 sec)

乘法的使用 (*)

mysql> Select date('2017-10-22' + INTERVAL 2*2 Year) AS 'Date After (2*2)Years';
+------------------------+
| Date After (2*2) Years |
+------------------------+
| 2021-10-22             |
+------------------------+
1 row in set (0.00 sec)

使用除号 (/)

mysql> Select date('2017-10-22' + INTERVAL 2/2 Year) AS 'Date After (2/2) Years';
+------------------------+
| Date After (2/2) Years |
+------------------------+
| 2018-10-22             |
+------------------------+
1 row in set (0.00 sec)

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