primary-key

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What is the difference between a unique key and primary key?...

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SQL UNIQUE Constraint

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SQL PRIMARY KEY Constraint

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Which of these is not a valid constraint?...

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What is primary key in SQL? Pick the most correct definition....

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Which of the following table definitions guarantee that column с1 cannot contain...

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Is the following composite Primary key definition correct: ...

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Given an empty table created using the following query: C...

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Can a Primary key serve as a Foreign key at the same time?...

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Pick all INSERT statements that will work correctly for the following table: ...