But it works as is? ? ?

create table test(id int, id2 int, status String) Engine=Memory as select number,number, ['approved', 'completed'][number%3] from numbers(10); select ROUND(count(distinct case when status = 'approved' then id else null end)/count(distinct id2) * 100) as "SR- txns" from test ┌─SR- txns─┐ │ 30 │ └──────────┘

Clickhouse style syntax:

select ROUND(uniqExactIf(id,status = 'approved')/uniqExact(id2) * 100) as "SR- txns" from test ┌─SR- txns─┐ │ 30 │ └──────────┘