How to change datatype of primary key field in mysql workbench?

Question

In mysql workbench, I created a new table and added a column id, and by default its datatype is set to INT, PK and NN boxes are selected. When I tried to change the datatype of id column to VARCHAR(), it gave the following error:

What is wrong?

Answer 1

change varchar() it to varchar(10) I believe you are missing the width of varchar

Answer 2

varchar() is an empty statement, seeking the width of the "string" that you are setting. You have to input the amount of characters to accept. (Ex: varchar(10) or varchar(45)).