Which two are true about external tables?
A)They can be stored in an ASM Cluster File System(ACFS).
B)They can always be updated using SQL.
C)They support the ORACLE_DATAPUMP access driver.
D)They have extents.
E)They support all DML operations.
Answer: AC
原文：https://www.cnblogs.com/cnblogs5359/p/11423047.html