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

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

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Physical Database Design
Which of the following are integrity controls that a DBMS may support?

Limit the use of null values in some fields.
All of these
Assume a default value in a field unless a user enters a value for that field.
Limit the set of permissible values that a field may assume.

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