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create table qtemp.i (i int)
insert into qtemp.i values(50),(100),(200),(0),(150)
select 500/5, avg(i) from qtemp.i
-- 500 / 5 AVG
-- 100 100
select 500/4, avg(case when i<>0 then i end)
from qtemp.i
-- 500 / 4 AVG
-- 125 125

Because the CASE has no ELSE, the result is the NULL value to replace any zero value. The NULL value is not /counted/ as part of the average.

Regards, Chuck

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