多选题The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs. View the Exhibit. Which two statements about the results of the query shown in the Exhibit are correct?（）AThe LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300. LAST_SCNBThe LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.CThe LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.DThe LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted. LAST_SCN
多选题
The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs. View the Exhibit. Which two statements about the results of the query shown in the Exhibit are correct?（）
A
The LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300. LAST_SCN
B
The LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.
C
The LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.
D
The LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted. LAST_SCN
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The EMP table has some discrepancy in data entry with a particular employee ID. You execute the query as shown in the Exhibit to retrieve all versions of the row that exist between two SCNs.View the Exhibit.Which two statements about the results of the query shown in the Exhibit are correct?（）A. The LAST_SCN value in the first row is NULL, which means that the versions of the row still exist at SCN 6636300. LAST_SCNB. The LAST_SCN value in the second row in NULL, which means that the version of the row still exists at SCN 6636300.C. The LAST_SCN value in the third row is 6636280, which means that the version of row exists above SCN 6636280.D. The LAST_SCN value in the second row is NULL, which means that the version of the row no longer exists because it was deleted. LAST_SCN
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多选题Which two statements are correct regarding the Flashback Versions Query feature？（）AYou can use this feature to identify the committed versions of the rows， but not the uncommitted versions.BYou can use this feature to identify the versions of V$ views.CYou can use this feature to identify the inserts， deletes， and updates performed on a particular row but not the data definition language （DDL） operations performed on the table.DYou can use this feature for a table only if row movement is enabled for the table.EYou can use this feature to identify the versions of external and fixed tables.
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