What is the procedure for making a PG column NULLABLE TRUE?

Problem

What is the best way to do this using Postgres? I tried the following code, but it doesn’t work:

ALTER TABLE mytable ALTER COLUMN mycolumn BIGINT NULL; 

Asked by mateusmaso

Solution #1

From the excellent manual:

ALTER TABLE mytable ALTER COLUMN mycolumn DROP NOT NULL;

When modifying the nullability, there’s no need to provide the type.

Answered by mu is too short

Post is based on https://stackoverflow.com/questions/4812933/how-to-change-a-pg-column-to-nullable-true