Nope, Sybase is Sybase - not MSSQL or Orable
You could try this:
declare @false bit
select @false = 0
create table alex_test ( [active_ind] [bit] default 0 NOT NULL , mynum
varchar (255))
insert into alex_test(mynum) values('one')
select * from alex_test where active_ind = @false
drop table alex_test
That's about as close as you'll get
