Go back to 1Z0-031 - Oracle9i Database: Fundamentals I

Question :-

Which is true when considering the number of indexes to create on a table?
Every column that is updated requires an index.
Every column that is queried is a candidate for an index.
Columns that are part of a WHERE clause are candidates for an index.
On a table used in a Data Warehouse application there should be no indexes.

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