DATE_SUB
subtracting days
sql
SELECT DATE_SUB('2025-09-05', INTERVAL 7 DAY);
-- Result: '2025-08-29'
SELECT DATE_SUB('2025-09-05', INTERVAL 3 MONTH);
-- Result: '2025-06-05'
SELECT DATE_SUB('2025-09-05', INTERVAL 1 YEAR);
-- Result: '2024-09-05'
SELECT DATE_SUB('2025-09-05 10:30:00', INTERVAL '2:15' HOUR_MINUTE);
-- Result: '2025-09-05 08:15:00'
WEEK(date , firstdayofweek) 周
Optional. Specifies what day the week starts on. Can be one of the following:
- 0 - First day of week is Sunday
- 1 - First day of week is Monday and the first week of the year has more than 3 days
- 2 - First day of week is Sunday
- 3 - First day of week is Monday and the first week of the year has more than 3 days
- 4 - First day of week is Sunday and the first week of the year has more than 3 days
- 5 - First day of week is Monday
- 6 - First day of week is Sunday and the first week of the year has more than 3 days
- 7 - First day of week is Monday
日期是第几周
sql
SELECT WEEK('2025-06-02 10:08:29', 2 ) - WEEK(DATE_SUB('2025-06-02 10:08:29',
INTERVAL DAYOFMONTH('2025-06-02 10:08:29') - 1 DAY), 2 )+1 AS week_of_month;
SELECT WEEK('2025-06-30 10:08:29', 2 ) - WEEK(DATE_SUB('2025-06-30 10:08:29',
INTERVAL DAYOFMONTH('2025-06-30 10:08:29') - 1 DAY), 2 )+1 AS week_of_month;
SELECT WEEK ( '2025-06-02 10:46:46', 2 ) -
WEEK ( DATE_FORMAT( '2025-06-02 10:46:46', '%Y-%m-01' ), 2 )+1
SELECT WEEK ( '2025-06-30 10:46:46', 2 ) - WEEK (
DATE_FORMAT( '2025-06-30 10:46:46', '%Y-%m-01' ), 2 )+1