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Which of the following is NOT a type of SQL constraint?

A. PRIMARY KEY

B. FOREIGN KEY

C. ALTERNATE KEY

D. UNIQUE

Answer: Option C

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Related Questions on SQL for Database Construction

The DROP TABLE statement:

A. deletes the table structure only.

B. deletes the table structure along with the table data.

C. works whether or not referential integrity constraints would be violated.

D. is not an SQL statement.