Columns with identical constraints

Question

Hi,
There is a table testtbl:
create table testtbl
  (prim_key number,
   f1 char(1),
   constraint testtbl_pk primary key (prim_key),
   constraint testtbl_f1_ck check (f1 in ('0','1'))
   );Columns f2, ..., f9 with the same check constraint as f1 need to be added to testtbl.
Can you please let me know if there is a way to do this without repeating the same list of values over and over.

Answer 1

The goal of all this is to find a way to represent somehow boolean data type in Oracle tables. Columns cannot be of boolean data type in Oracle. Char(1) with values '0' and '1' closely represents boolean type (varchar2(1) is identical to char(1)).
It looks like the following type can help:
SQL> create or replace type bool as object
  2  (
  3   bool_val char(1),
  4 
  5    constructor function bool(b1 in number) return self as result
  6  )
  7  /
Type created
SQL>
SQL> create or replace type body bool as
  2 
  3   constructor function bool(b1 in number) return self as result is
  4 
  5   begin
  6      if b1 = 0 or b1 = 1 then
  7          self.bool_val := b1;
  8          return;
  9      else
10         RAISE_APPLICATION_ERROR(-20001, 'Invalid boolean value.');
11    end if;
12   end;
13 
14  end;
15  /
Type body createdNow I can create columns of type bool in any table. Not null constraint is optional:
SQL> create table ztest1 (primkey number, f1 bool not null, f2 bool not null, f3 bool not null);
Table created
SQL> create table ztest2 (primkey number, f4 bool not null, f5 bool not null, f6 bool not null);
Table created
SQL> insert into ztest1 values (1, bool(0), bool(1), bool(1));
1 row inserted
SQL> insert into ztest1 values (2, bool(1), bool(0), bool(0));
1 row inserted
SQL> commit;
Commit completeColumns are easy to use:
SQL> select primkey from ztest1 where f1 = bool(1);
   PRIMKEY
         2Attempt to use bool() with invalid parameter results in exception:
SQL> insert into ztest2 values (3, bool(0), bool(2), bool(0));
insert into ztest2 values (3, bool(0), bool(2), bool(0))
ORA-20001: Invalid boolean value.I am still having a problem with default constructor of bool: e.g., bool('a') does not raise an exception, unfortunately.