mysql 0000-00-00 00:00:00转换为null

Question

In mysql Timestamp , I want to convert 0000-00-00 00:00:00 to null .

first I use, set sql_safe_updates = 0;

second I do, UPDATE TABLE SET FILED = NULL WHERE FILED = '0000-00-00 00:00:00';

but it also converts the current time like this: 2018-07-31 13:46:00

what's the problem?

Answer 1

First, change your field definition to allow NULL values. Use the following:

ALTER TABLE <tablename> MODIFY <columnname> TIMESTAMP NULL DEFAULT NULL;