How to Change Default Null to NOT NULL in MySQL

Question

I have the following column in table room Now I want to change the definition of column property_id from NULL to NOT NULL How can I do this following Query is not working

ALTER TABLE `room` CHANGE `property_id` `property_id` bigint(20)  NOT NULL;

Actual definition of Column is :

 `property_id` bigint(20) DEFAULT NULL,

Answer 1

在 mysql 中，您可以实现这一点，

ALTER TABLE room MODIFY property_id bigint(20) not null;

Answer 2

我的查询非常好，唯一的错误是有些行包含空记录，因此为什么会产生问题