Remove uniqueness of index in PostgreSQL

Question

In my PostgreSQL database I have a unique index created this way:

CREATE UNIQUE INDEX  ON  USING btree (my_column)

Answer 1

I don't think it's possible... even in the pgAdmin III UI, if you try to edit a constraint created with your statement, the "Unique" box is greyed-out; you can't change it through the UI. Combined with your research on the ALTER INDEX docs, I'd say it can't be done.