http://www.youtube.com/watch?v=xlo1c3Rvkwk
http://tudorchirila.blogspot.ro/2013/12/declar-pierduta-tara.html
The new FILTER clause in Aggregations
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Oracle 26.1 introduces the new FILTER clause that can be used in
aggregations.
Thus, for example, *in a SUM aggregation you can use FILTER WHERE ...*
...
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