Глоссарий терминов Oracle
Перевод агрегатная группа
Описание As an aggregate function CUME_DIST calculates for a hypothetical row R identified by the arguments of the function and a corresponding sort specification the relative position of row R among the rows in the aggregation group. Oracle makes this calculation as if the hypothetical row R were inserted into the group of rows to be aggregated over. The arguments of the function identify a single hypothetical row within each aggregate group. Therefore they must all evaluate to constant expressions within each aggregate group.