单选题Which statement is true regarding Flashback Version Query?()A
It returns versions of rows only within a transaction.B
It can be used in subqueries contained only in a SELECT statement.C
It will return an error if the undo retention time is less than
题目内容(请给出正确答案)
单选题
Which statement is true regarding Flashback Version Query?()
A
It returns versions of rows only within a transaction.
B
It can be used in subqueries contained only in a SELECT statement.
C
It will return an error if the undo retention time is less than the lower bound time or SCN specified.
D
It retrieves all versions including the deleted as well as subsequently reinserted versions of the rows.