MySQL将考虑随附的一组单位值中提供的两个中的第一个值。在根据INTERVAL关键字给出的单位，根据封闭集合中的考虑值，计算间隔后，它将返回输出以及警告。
以下示例将对其进行澄清-
mysql> Select TIMESTAMP('2017-10-22 04:05:36' + INTERVAL '4 2' Hour)AS 'HOUR VALUE INCREASED BY 4';
+---------------------------+
| HOUR VALUE INCREASED BY 4 |
+---------------------------+
| 2017-10-22 08:05:36 |
+---------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> Show warnings;
+---------+------+------------------------------------------+
| Level | Code | Message |
+---------+------+------------------------------------------+
| Warning | 1292 | Truncated incorrect INTEGER value: '4 2' |
+---------+------+------------------------------------------+
1 row in set (0.00 sec)
