未知题型

A.Theconstraintremainsvalid.
B.Theindexontheconstraintisdropped.
C.ItallowstheloadingofdataintothetableusingSQL*Loader.
D.Newdataconformstotheconstraint,butexistingdataisnotchecked.
E.ItallowsthedatamanipulationonthetableusingINSERT/UPDATE/DELETESQLstatements.
【参考答案】

A, B, C