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Where NULLs go in PostgreSQL ORDER BY

In PostgreSQL, a query runs ORDER BY discount DESC on a column that has NULL values. Where do the NULL rows appear by default?

A.First, because NULLs sort as larger than any valueB.Last, because NULLs are always placed at the endC.They are left out of the resultD.In random positions mixed with other rows

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Where NULLs go in PostgreSQL ORDER BY

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