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which three statements are true about indexes and their administration in an Oracle database?

which three statements are true about indexes and their administration in an Oracle database?

A.

The same table column can be part of a unique and non-unique index

B.

A DESCENDING INDEX IS A type of function-based index

C.

A DROP INDEX statement always prevents updates to the table during the drop operation

D.

AN INVISIBLE INDEX is not maintained when DML is performed on its underlying table.

E.

AN INDEX CAN BE CREATED AS part of a CREATE TABLE statement

F.

IF a query filters on an indexed column then it will always be used during execution of query

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