Postgresql - ADD/ REMOVE - DEFAULT VALUE FROM A COLUMN

 -- EXAMPLE: MY_TABLE_NAME HAVE A DEFAULT TOTAL OF 0 

ALTER TABLE MY_TABLE_NAME ALTER COLUMN TOTAL_CENTS SET DEFAULT 0;

-- EXAMPLE: MY_TABLE_NAME ARE AVAILABLE BY DEFAULT

ALTER TABLE MY_TABLE_NAME ALTER COLUMN AVAILABLE SET DEFAULT TRUE;

ALTER TABLE MY_TABLE_NAME ALTER COLUMN TOTAL_CENTS DROP DEFAULT;