多项选择题
A. A range of SCN values
B. A list of SCN values
C. A starting and ending timestamp
D. Minimum and maximum sequence values
E. A list of sequence values
单项选择题 WhichpseudocolumncouldyouusetoidentifyauniquerowinaFlashbackVersionsQuery？（）
单项选择题 WhichofthefollowingstatementsbestdescribesFlashbackVersionsQuery？（）
多项选择题 Users notify you that their application is failing every time they try to add new records. Because of poor application design， the actual ORA error message is unavailable. What might be the problem？（）