Aggregate bitwise-OR in a subquery

Question

Given the following table:

CREATE TABLE BitValues ( n int )

Is it possible to compute the bitwise-OR of n for all rows with

Answer 1

Preparations:

if object_id(N'tempdb..#t', N'U') is not null drop table #t;
create table #t ( n int );
insert into #t values (1), (2), (4), (3);

Solution:

select max(n & 8) + max(n & 4) + max(n & 2) + max(n & 1) from #t;