declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE EMPRESA ADD INDENVIAEMAILCOMISSAO NUMBER(1,0)';
  exception when column_exists then null;
end;
/
declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE EMPRESA ADD EMAIL_PENDENCIA VARCHAR(50)';
  exception when column_exists then null;
end;
/
declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE FECHAMENTO_CNTCORRENTE ADD INDEMAILENVIADO NUMBER(1,0)';
  exception when column_exists then null;
end;
/
declare
  ja_existe  exception;
  pragma exception_init (ja_existe  , -00001);
begin
  execute immediate 'UPDATE FECHAMENTO_CNTCORRENTE SET INDEMAILENVIADO = 1';
  exception when ja_existe  then null;
end;