SQL查询以选择添加日期的行在同一表的字段中的过期时间

Question

I have a table that has a date_added column and an expiry time, set in days.

I have tried the following:

select * 
from `claims` 
where date_added(`date_added`, interval `expire_period` day) < date(now())

I have tried reformatting and still getting an error.

This is solved:

SELECT * FROM dk . claims WHERE DATE_ADD( date_added , interval expire_period day) < date(now());

Answer 1

Try this:

select * 
from claims 
where date_add(date_added, interval expire_period day) < date(now())

Reference of DATE_ADD

Answer 2

Your SQL syntax is wrong. There is no function date_added . What you need is date_add .

SELECT * 
FROM claims 
WHERE DATE_ADD(date_added, INTERVAL expire_period DAY) < DATE(NOW());

Your error message will have told you something like:

SQL ERROR (1064): You have an error in your SQL syntax; check the manual that correcsponds to your MySQL server version for the right syntax to use near ') < date(now())' at line 1.

So it did not know what to do with the closing bracket. From there, you can track back to see where the open bracket is. Next to date_added . And that is not a function.

You can also rely on the database client. I'm using HeidiSQL on Windows, and it highlights all keywords (including functions). The date_added is not blue in your query.