Physical Database Design
Which of the following improves a query's processing time?

Use compatible data types.
Combine a table with itself.
Write complex queries.
Query one query within another.

ANSWER DOWNLOAD EXAMIANS APP

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

Be careful indexing attributes that have null values.
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.
Indexes are more useful on smaller tables.

ANSWER DOWNLOAD EXAMIANS APP