> > I'm still quite new at this but it should be a simple operation: How do I
> > drop a column form a Postgres table. The next best thing would be knowing
> > how to change a column so that it can accept null values.
>
> Adding columns is directly supported. Removing columns, or redefining
> them, is done with a CREATE TABLE AS/DROP TABLE/CREATE TABLE AS/DROP
> TABLE sequence, where you write the columns you want to retain into a
> temporary table, delete the original table, and then do the same back
> into a new table with the same name as the original.
But this method might lose some characteristics such as primary key,
unique constraints, no?
---
Tatsuo Ishii