declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE PTOVTA_SEGURO ADD INDVENDESEGUROOPCEMBARCADA NUMBER (1,0) DEFAULT 1';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE PTOVTA_SEGURO ADD INDVENDESEGUROTABELAEMBARCADA NUMBER (1,0) DEFAULT 1';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE PTOVTA_SEGURO ADD INDTAXAEMBARQUEEMBARCADA NUMBER (1,0) DEFAULT 1';
    exception when column_exists then null;
end;