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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.
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what is meant semantic query optimization? how does it differ from other query optimization techniques?
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triggering
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Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
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