如何计算MySQL中日期相差的年月周日数？

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sql

1.差异年数: SELECT TIMESTAMPDIFF(YEAR, DATE_ADD(NOW(), INTERVAL -400 DAY), NOW()) AS 差异年数;

2.差异月数: SELECT TIMESTAMPDIFF(MONTH, DATE_ADD(NOW(), INTERVAL -400 DAY), NOW()) AS 差异月数;

1、相差年数

1. SELECT
2. NOW() 当前日期,
3. DATE_ADD(NOW(), INTERVAL - 400 DAY) 历史日期,
4. TIMESTAMPDIFF(
5. YEAR,
6. DATE_ADD(NOW(), INTERVAL - 400 DAY),
7. NOW()
8. ) AS 相差年;

2、相差月数

1. SELECT
2. NOW() 当前日期,
3. DATE_ADD(NOW(), INTERVAL - 400 DAY) 历史日期,
4. TIMESTAMPDIFF(
5. MONTH,
6. DATE_ADD(NOW(), INTERVAL - 400 DAY),
7. NOW()
8. ) AS 相差月;

3、相差周数

1. SELECT
2. NOW() 当前日期,
3. DATE_ADD(NOW(), INTERVAL - 400 DAY) 历史日期,
4. TIMESTAMPDIFF(
5. WEEK,
6. DATE_ADD(NOW(), INTERVAL - 400 DAY),
7. NOW()
8. ) AS 相差周;

4、相差天数

整理了一下三种方式：

1. SELECT
2. NOW() 当前日期,
3. DATE_ADD(NOW(), INTERVAL - 400 DAY) 历史日期,
4. TIMESTAMPDIFF(
5. DAY,
6. DATE_ADD(NOW(), INTERVAL - 400 DAY),
7. NOW()
8. ) AS 相差日;
9. SELECT
10. TO_DAYS('2018-09-10') - TO_DAYS('2017-09-01') AS 相差天数;
11. SELECT
12. DATEDIFF(NOW(), '2018-09-01') AS 相差天数;