Do this:
ALTER TABLE mytable MODIFY mycolumn VARCHAR(255);
Ps. You have to know what the original type is.
Reference:
https://stackoverflow.com/questions/212939/how-do-i-modify-a-mysql-column-to-allow-null
Do this:
ALTER TABLE mytable MODIFY mycolumn VARCHAR(255);
Ps. You have to know what the original type is.
Reference:
https://stackoverflow.com/questions/212939/how-do-i-modify-a-mysql-column-to-allow-null