Alter SQL table - allow NULL column value

Question

Initially, the table "MyTable" has been defined in the following way:

CREATE TABLE IF NOT EXISTS `MyTable` (   `Col1` smallint(6) NOT NULL AUTO_INCREMENT,   `Col2` smallint(6) DEFAULT NULL,   `Col3` varchar(20) NOT NULL, ); 

How to update it in such a way that the column "Col 3" would be allowed to be NULL?

Answer 1

ALTER TABLE MyTable MODIFY Col3 varchar(20) NULL;