time_round

description

Syntax

DATETIME TIME_ROUND(DATETIME expr)

DATETIME TIME_ROUND(DATETIME expr, INT period)

DATETIME TIME_ROUND(DATETIME expr, DATETIME origin)

DATETIME TIME_ROUND(DATETIME expr, INT period, DATETIME origin)

函数名 TIME_ROUND 由两部分组成，每部分由以下可选值组成

  • TIME: SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR
  • ROUND: FLOOR, CEIL

返回 expr 的上/下界。

  • period 指定每个周期有多少个 TIME 单位组成，默认为 1。
  • origin 指定周期的开始时间，默认为 1970-01-01T00:00:00，WEEK 的默认开始时间为 1970-01-04T00:00:00，即周日。可以比 expr 大。
  • 请尽量选择常见 period，如 3 MONTH，90 MINUTE 等，如设置了非常用 period，请同时指定 origin。

example

  2. MySQL> SELECT YEAR_FLOOR('20200202000000');
  3. +------------------------------+
  4. | year_floor('20200202000000') |
  5. +------------------------------+
  6. | 2020-01-01 00:00:00          |
  7. +------------------------------+
  10. MySQL> SELECT MONTH_CEIL(CAST('2020-02-02 13:09:20' AS DATETIME), 3); --quarter
  11. +--------------------------------------------------------+
  12. | month_ceil(CAST('2020-02-02 13:09:20' AS DATETIME), 3) |
  13. +--------------------------------------------------------+
  14. | 2020-04-01 00:00:00                                    |
  15. +--------------------------------------------------------+
  18. MySQL> SELECT WEEK_CEIL('2020-02-02 13:09:20', '2020-01-06'); --monday
  19. +---------------------------------------------------------+
  20. | week_ceil('2020-02-02 13:09:20', '2020-01-06 00:00:00') |
  21. +---------------------------------------------------------+
  22. | 2020-02-03 00:00:00                                     |
  23. +---------------------------------------------------------+
  26. MySQL> SELECT MONTH_CEIL(CAST('2020-02-02 13:09:20' AS DATETIME), 3, CAST('1970-01-09 00:00:00' AS DATETIME)); --next rent day
  27. +-------------------------------------------------------------------------------------------------+
  28. | month_ceil(CAST('2020-02-02 13:09:20' AS DATETIME), 3, CAST('1970-01-09 00:00:00' AS DATETIME)) |
  29. +-------------------------------------------------------------------------------------------------+
  30. | 2020-04-09 00:00:00                                                                             |
  31. +-------------------------------------------------------------------------------------------------+

keyword

TIME_ROUND