[ADMIN] changing column size in postgres

hello How do i change the definition of  a column? one of the columns width is not sufficient to store the data. I want to change the width. how to do that in postgres? I tried doing alter table + change/modify. both of them doesn't work in postgres.    and what is the maximum size to which a postg

[ADMIN] a problem

hello How do i change the definition of  a column? one of the columns width is not sufficient to store the data. I want to change the width. how to do that in postgres? I tried doing alter table + change/modify. both of them doesn't work in postgres.    and what is the maximum size to which a post