How to query records where one field greater than another by x days?

Question

I have a table like:

+----+------------+------------+
| id | expiry     | timestamp  |
+----+------------+------------+
|  1 | 2018-11-29 | 2018-11-01 |
|  2 | 2018-12-27 | 2018-11-01 |
|  3 | 2019-01-31 | 2018-11-01 |
|  4 | 2018-11-29 | 2018-11-01 |
|  5 | 2018-12-27 | 2018-11-01 |
+----+------------+------------+

How can I query all records for which expiry is less than 30 days from timestamp ? ie

timestamp + 30 days > expiry

Answer 1

我建议：

where expiry < timestamp + interval 30 day

Answer 2

你可以试试这个

SELECT * FROM table_name WHERE DATE_ADD(TIMESTAMP , INTERVAL 30 DAY) > expiry;