COMMIT; ALTER TABLE ADD COLUMN NOT NULL; ALTER TABLE ALTER COLUMN SET DATA TYPE ; ALTER TABLE ALTER COLUMN NOT NULL; ALTER TABLE ALTER COLUMN NULL; ALTER TABLE DEFAULT ; COMMENT ON COLUMN . IS ''; ALTER TABLE ADD CONSTRAINT PRIMARY KEY ( , ); ALTER TABLE DROP PRIMARY KEY; " CREATE VIEW ( , ) AS " CREATE TABLE ( NOT NULL DEFAULT , ); ALTER TABLE ADD CONSTRAINT PRIMARY KEY ( , ); UNIQUE CREATE INDEX ON ();