DATE_FLOOR

説明

date_floorは、指定された時間間隔の最も近い下位境界に、与えられた日付を丸めます。

構文

DATE_FLOOR(<datetime>, INTERVAL <period> <type>)

パラメータ

パラメータ	説明
datetime	引数は有効な日付式です
period	引数は各期間を構成する単位数を指定し、開始時刻は0001-01-01T00:00:00です
type	引数は次のいずれかです: YEAR、MONTH、DAY、HOUR、MINUTE、SECOND

戻り値

戻り値は日付または時刻で、入力値を指定された単位に切り下げた結果を表します。

例

select date_floor("0001-01-01 00:00:16",interval 5 second);

+---------------------------------------------------------------+
| second_floor('0001-01-01 00:00:16', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 0001-01-01 00:00:15                                           |
+---------------------------------------------------------------+

select date_floor("0001-01-01 00:00:18",interval 5 second);

+---------------------------------------------------------------+
| second_floor('0001-01-01 00:00:18', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 0001-01-01 00:00:15                                           |
+---------------------------------------------------------------+

select date_floor("2023-07-13 22:28:18",interval 5 minute);

+---------------------------------------------------------------+
| minute_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 2023-07-13 22:25:00                                           |
+---------------------------------------------------------------+

select date_floor("2023-07-13 22:28:18",interval 5 hour);

+-------------------------------------------------------------+
| hour_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+-------------------------------------------------------------+
| 2023-07-13 18:00:00                                         |
+-------------------------------------------------------------+

select date_floor("2023-07-13 22:28:18",interval 5 day);

+------------------------------------------------------------+
| day_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+------------------------------------------------------------+
| 2023-07-10 00:00:00                                        |
+------------------------------------------------------------+

select date_floor("2023-07-13 22:28:18",interval 5 month);

+--------------------------------------------------------------+
| month_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+--------------------------------------------------------------+
| 2023-07-01 00:00:00                                          |
+--------------------------------------------------------------+

select date_floor("2023-07-13 22:28:18",interval 5 year);

+-------------------------------------------------------------+
| year_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+-------------------------------------------------------------+
| 2021-01-01 00:00:00                                         |
+-------------------------------------------------------------+