declare
    object_exists exception;
    pragma exception_init (object_exists , -01430);
begin
	execute immediate 'ALTER TABLE PRICING_ESPECIFICO ADD (EXIBEVENDA NUMBER(1,0))';
	exception when object_exists then null;
end;
/

declare
    object_exists exception;
    pragma exception_init (object_exists , -01430);
begin
	execute immediate 'ALTER TABLE PRICING ADD (EXIBEVENDA NUMBER(1,0))';
	exception when object_exists then null;
end;