select
User,
(
case Name when '' then 0 else 1 end
+
case when Age is null then 0 else 1 end
+
case Country when '' then 0 else 1 end
+
case Gender when '' then 0 else 1 end
+
case when Height is null then 0 else 1 end
) * 100 / 5 as complete
Gebruik de case volgens wat geen info betekent:leeg of null.