Question : Contraint for 1 or 0

I created a number column to act as a Boolean data type.
How can I create a constraint  to only allow 0 or 1 ?

Answer : Contraint for 1 or 0

Easiest way is with a regular expression.
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drop table tab1 purge;
create table tab1 (
	col1 number,
	constraint col1_binary check (regexp_like(col1,'^[0-1]+$'))
);

insert into tab1 values(0);
insert into tab1 values(1);
insert into tab1 values(0101010101010101010);
insert into tab1 values(2);
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