Jak převést data z jednoho řádku do jednoho sloupce v oracle

Můžete zkusit použít unpivot

select v
from (
  SELECT 'A' column1,'B' column2,'C' column3,'D' column4  from dual
) t
unpivot
(
  v  for val in (column1,column2,column3,column4)
) u;

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