SELECT AVG (CASE WHEN Value <> 0 THEN Value ELSE NULL END) …. AVG function will not take into account NULL values. So you can also use this AVG (NULLIF(Value, 0))
SELECT AVG (CASE WHEN Value <> 0 THEN Value ELSE NULL END) …. AVG function will not take into account NULL values. So you can also use this AVG (NULLIF(Value, 0))