A rule of thumb for choosing indexes for a relational database includes which of the following? Options: A . &nbspIndexes are more useful for columns that do not appear frequently in the WHERE clause in queries. B . &nbspDo not specify a unique index for the primary key of each table. C . &nbspBe careful indexing attributes that have null values. D . &nbspIndexes are more useful on smaller tables.

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 for columns that do not appear frequently in the WHERE clause in queries.

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

C . Be careful indexing attributes that have null values.

D . Indexes are more useful on smaller tables.

Answer: Option C

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