On sun, 2007-07-15 at 15:35 -0400, Rajarshi Guha wrote:
> Hi, is there a built in function that will give me the number of bits
> that are set to 1 in a bit string field?
no, but it should be trivial to do with pl/pgsql
a naive implementation could be:
create or replace function bitsetlen(bit) returns int as $$
declare i int;
c int;
begin
c:=0;
for i in 1..length($1) loop
if substring($1,i,1)=B'1' then
c:=c+1;
end if;
end loop;
return c;
end;
$$ language plpgsql;
gnari
