IF EXISTS (SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'usuario' AND COLUMN_NAME = 'cgccpf')
BEGIN
	IF ((SELECT CHARACTER_MAXIMUM_LENGTH FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'usuario' AND COLUMN_NAME = 'cgccpf') < 20)
	BEGIN
		ALTER TABLE usuario ALTER COLUMN cgccpf VARCHAR(20)
	END
END