Peng Yu <pengyu...@gmail.com> wrote:
> I use || to count distinct on multiple fields. It works for this
> particular example. But I'm not sure if it is robust. Would you please
> let me know if there is any better way?
> 
> select distinct value1, value2 from test;
> select count(distinct value1||value2) from test;

select count(*) from
(select distinct value1, value2 from test);

-- 
Igor Tandetnik

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