Learn how SQL Sequences work to generate unique numeric values for primary keys and other identifiers. This MCQ set covers sequence creation, usage, caching, cycling, and differences across database systems.
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In Oracle, how do you retrieve the next value from a sequence named order_seq?
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Question 4 of 15
4. Question
What does the INCREMENT BY clause in a sequence define?
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Question 5 of 15
5. Question
Which option allows a sequence to restart from its minimum value after reaching its maximum?
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Question 6 of 15
6. Question
In PostgreSQL, how do you reset a sequence named id_seq to 1?
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Question 7 of 15
7. Question
What is the effect of using CACHE 20 when creating a sequence?
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Question 8 of 15
8. Question
Which keyword specifies the smallest number a sequence can generate?
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Question 9 of 15
9. Question
If NOCYCLE is used and the maximum value is reached, what happens?
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Question 10 of 15
10. Question
Which of the following is NOT a valid use of a sequence?
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Question 11 of 15
11. Question
What happens if two sessions request NEXTVAL from the same sequence simultaneously?
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Question 12 of 15
12. Question
In MySQL 8.0, sequences are implemented through…
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Question 13 of 15
13. Question
Which statement modifies an existing sequence’s increment value?
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Question 14 of 15
14. Question
Why might a sequence have gaps in generated values?
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Question 15 of 15
15. Question
Which clause sets the first value a sequence generates?
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Summary
These SQL Sequence MCQs cover creation, usage, caching, cycling, and resetting sequences across Oracle, PostgreSQL, and MySQL. They help you master auto-number generation for primary keys and identifiers in databases.
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