Discussion
Which statement about sequences is not true?
Answer: D
Correct answer: Sequences guarantee valid surrogate key values.
A sequence guarantees only that it will not hand out the same number twice. It cannot guarantee that the number is used, or used in the intended table, or that no one has inserted a conflicting value directly - numbers are also lost on rollback and on instance failure. The other three statements are correct descriptions of what a sequence is and does.
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