TIMEDIFF()

函数说明

TIMEDIFF() 返回两个 TIME 或 DATETIME 值之间的差值。TIMEDIFF() 函数的两个表达式必须为相同类型的参数，即 TIME 或 DATETIME。TIMEDIFF 函数返回表示为时间值的 expr1 - expr2 的结果。

函数语法

  1. > TIMEDIFF(expr1,expr2)

参数释义

参数说明
expr1, expr2必要参数。expr1 和 expr2 表达式需要具有相同的类型。expr1 和 expr2 是转换为 TIME 或 DATETIME 表达式的字符串。如果 expr1 或 expr2 为 NULL 则返回 NULL。

示例

  1. mysql> select timediff("22:22:22", "11:00:00");
  2. +------------------------------+
  3. | timediff(22:22:22, 11:00:00) |
  4. +------------------------------+
  5. | 11:22:22.000000              |
  6. +------------------------------+
  7. 1 row in set (0.01 sec)
  9. mysql> select timediff(cast('22:22:22' as time), null);
  10. +--------------------------------------------+
  11. | timediff(cast(22:22:22 as time(26)), null) |
  12. +--------------------------------------------+
  13. | NULL                                       |
  14. +--------------------------------------------+
  15. 1 row in set (0.00 sec)
  17. mysql> select timediff(CAST('2017-08-08 22:22:22' as datetime), CAST('2000-01-02 11:00:00' as datetime));
  18. +------------------------------------------------------------------------------------------------+
  19. | timediff(cast(2017-08-08 22:22:22 as datetime(26)), cast(2000-01-02 11:00:00 as datetime(26))) |
  20. +------------------------------------------------------------------------------------------------+
  21. | 154283:22:22                                                                                   |
  22. +------------------------------------------------------------------------------------------------+
  23. 1 row in set (0.00 sec)
  1. create table time_01(t1 time,t2 time,t3 time);
  2. insert into time_01 values("-838:59:59.0000","838:59:59.00","22:00:00");
  3. insert into time_01 values("0:00:00.0000","0","0:00");
  4. insert into time_01 values(null,NULL,null);
  5. insert into time_01 values("23","1122","-1122");
  6. insert into time_01 values("101412","4","-101219");
  7. insert into time_01 values("24:59:09.932823","24:02:00.93282332424","24:20:34.00000000");
  8. insert into time_01 values("2022-09-08 12:00:01","019","23403");
  10. mysql> select * from time_01;
  11. +------------+-----------+-----------+
  12. | t1         | t2        | t3        |
  13. +------------+-----------+-----------+
  14. | -838:59:59 | 838:59:59 | 22:00:00  |
  15. | 00:00:00   | 00:00:00  | 00:00:00  |
  16. | NULL       | NULL      | NULL      |
  17. | 00:00:23   | 00:11:22  | -00:11:22 |
  18. | 10:14:12   | 00:00:04  | -10:12:19 |
  19. | 24:59:10   | 24:02:01  | 24:20:34  |
  20. | 12:00:01   | 00:00:19  | 02:34:03  |
  21. +------------+-----------+-----------+
  22. 7 rows in set (0.00 sec)
  24. mysql> select timediff(t1,t2) from time_01;
  25. +------------------+
  26. | timediff(t1, t2) |
  27. +------------------+
  28. | -1677:59:58      |
  29. | 00:00:00         |
  30. | NULL             |
  31. | -00:10:59        |
  32. | 10:14:08         |
  33. | 00:57:09         |
  34. | 11:59:42         |
  35. +------------------+
  36. 7 rows in set (0.00 sec)