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Differentiate between a unique key and a primary key.
- By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
- Primary key doesn't allow NULLs however unique key allows one NULL.
what is relationship inheritance and attribute inheritance
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The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
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