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[英]How do I select datediff between a date and time column and a date column from two different tables in MySQL?
[英]datediff MySQL between one particular date and a column
我在 dd-mm-yyyy 中有日期列,如下所示:
| xdate |
----------
| 30-07-2001 |
| 21-09-2003 |
| 16-06-2020 |
如何計算從“2021-11-10”到xdate列的一個特定日期之間的日期差異並以年、月和日表示?
dd-mm-yyyy
不是有效的MySQL
日期時間格式。 我建議您始終以日期時間類型存儲日期。
對於您的情況,一個簡單的解決方案可能不是大數據性能的最佳解決方案:
SELECT DATEDIFF('2021-11-10',date_format(str_to_date(xdate,'%d-%m-%Y'),'%Y-%m-%d')) AS days
FROM test_tbl;
演示: https : //www.db-fiddle.com/f/7yUJcuMJPncBBnrExKbzYz/127
對於 MONTHS 和 YEARS,您可以嘗試:
SELECT TIMESTAMPDIFF(MONTH, date_format(str_to_date(xdate, '%d-%m-%Y'), '%Y-%m-%d'),'2021-11-10' ) AS months
FROM test_tbl;
SELECT TIMESTAMPDIFF(YEAR, date_format(str_to_date(xdate, '%d-%m-%Y'), '%Y-%m-%d'),'2021-11-10' ) AS years
FROM test_tbl;
演示: https : //www.db-fiddle.com/f/7yUJcuMJPncBBnrExKbzYz/129
更多關於 DATEDIFF:
https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_datediff
如果你想要 MONTH , YEAR ,你可以使用 TIMESTAMPDIFF ... https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_timestampdiff
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