Modify column Vs change column

Question

I know, we can not rename a column using modify column syntax,but can change column syntax.

My question is: what is the main usage of

Answer 1

Change Column : Used when we want to change the column name with its definition. eg - alter table student CHANGE name full_name VARCHAR(32) NOT NULL;

Modify column : Used when column name is to be same but change in its definition. eg - alter table student MODIFY full_name VARCHAR(64) NOT NULL;

Rename column : Used when we only need to change the column name (its definition will be same) alter table student RENAME COLUMN full_name TO name;