Physical Database Design
If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?

All fields are stored in four relations.
All fields are stored in one relation.
All fields are stored in two relations.
All fields are stored in three relations.

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Physical Database Design
A rule of thumb for choosing indexes for a relational database includes which of the following?

Do not specify a unique index for the primary key of each table.
Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
Be careful indexing attributes that have null values.
Indexes are more useful on smaller tables.

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