如果 MySQL TIMEDIFF() 函数的输出超出 TIME 字段的范围值会发生什么？

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我们知道MySQL中TIME字段的范围是‘-838:59:59’到‘838:59:59’。现在，如果 TIMEDIFF() 函数的输出超出此范围，则 MySQL 将返回 \'-838:59:59\' 或 \'838:59:59\'，具体取决于参数的值。

示例

mysql> Select TIMEDIFF(\'2017-09-01 03:05:45\',\'2017-10-22 03:05:45\')AS \'Out of Range TIME Difference\';
+------------------------------+
| Out of Range TIME Difference |
+------------------------------+
| -838:59:59                   |
+------------------------------+
1 row in set, 1 warning (0.00 sec)

mysql> Select TIMEDIFF(\'2017-10-22 04:05:45\',\'2017-09-01 03:05:45\')AS \'Out of Range TIME Difference\';
+------------------------------+
| Out of Range TIME Difference |
+------------------------------+
| 838:59:59                    |
+------------------------------+
1 row in set, 1 warning (0.01 sec)

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