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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.
The Enhanced Entity Relationship Diagram (ERD) produced with a drawing or case tool. Your EERD must use a ''standard'' notation style such as Crows Foot or Chen. Please note that t
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Three way to handle missing field val
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