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,
         


        

Answer 1

ALTER TABLE MyTable MODIFY Col3 varchar(20) NULL;

Answer 2

The following MySQL statement should modify your column to accept NULLs.

ALTER TABLE `MyTable`
ALTER COLUMN `Col3` varchar(20) DEFAULT NULL