There are probably fast better ways. But this is one way:
postgres=> SELECT LENGTH( REPLACE( CAST( B'101000000000000000000010'
AS TEXT ), '0', ''));
length
--------
3
On Tue, Feb 21, 2012 at 7:32 AM, Cheng <niechenghust(at)gmail(dot)com> wrote:
> For example, I have a bit string as:
>
> B'101000000000000000000010'
>
> How do I count the number of ones in it? In this example, it is 3.
>
> Thanks,
> Cheng
>
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Regards,
Richard Broersma Jr.