A rule of thumb for choosing indexes for a relational database includes which of

Question

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

Options:

A . Indexes are more useful on smaller tables.

B . Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.

C . Do not specify a unique index for the primary key of each table.

D . Be careful indexing attributes that have null values.

Answer: Option D

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