Postgres Alter Column Integer to Boolean

Question

I\'ve a field that is INTEGER NOT NULL DEFAULT 0 and I need to change that to bool.

This is what I am using:

ALTER TABLE mytabe 
ALTER mycolumn TYPE bool         


        

Answer 1

Try this:

ALTER TABLE mytabe ALTER COLUMN mycolumn DROP DEFAULT;
ALTER TABLE mytabe ALTER mycolumn TYPE bool USING CASE WHEN mycolumn=0 THEN FALSE ELSE TRUE END;
ALTER TABLE mytabe ALTER COLUMN mycolumn SET DEFAULT FALSE;

You need to remove the constraint first (as its not a boolean), and secondly your CASE statement was syntactically wrong.