[sql] How to add a boolean datatype column to an existing table in sql?

I have a table called person in my database. I want to add another column to the same table and it's a Boolean datatype column. I have tried following queries but it says syntax error near default. I know this is a common and there are lot of answers. I have tried many of them and couldn't figure out to make it work. So please help me.

queries I have tried

ALTER TABLE person add column "AdminApproved" BOOLEAN SET default FALSE;
ALTER TABLE person alter column "AdminApproved" BOOLEAN SET default FALSE;         

I have tried without SET key word too.

Below query worked for me with default value false;

ALTER TABLE cti_contract_account ADD ready_to_audit BIT DEFAULT 0 NOT NULL;

In phpmyadmin, If you need to add a boolean datatype column to an existing table with default value true:

ALTER TABLE books
   isAvailable boolean default true;

The answer given by P????? creates a nullable bool, not a bool, which may be fine for you. For example in C# it would create: bool? AdminApprovednot bool AdminApproved.

If you need to create a bool (defaulting to false):

    ALTER TABLE person
    ADD AdminApproved BIT
    DEFAULT 0 NOT NULL;