Computer Science · Database Management Systems
Which of the following statements regarding the characteristics of SQL Indexes are correct? A. An SQL Index is a lookup structure that significantly improves the performance of SELECT and WHERE clauses. B. While indexes speed up data retrieval, they slow down INSERT, UPDATE, and DELETE operations because the index must be updated on every change. C. A table is restricted to having only one index, which is automatically created for the Primary Key in most RDBMS. D. A unique index enforces a constraint ensuring that there are no duplicate values in the indexed column or columns. Choose the most appropriate answer from the options given below:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A, B, C, and D
- 2A, B, and D Only✓
- 3B, C, and D Only
- 4A, C, and D Only
Correct answer
A, B, and D Only
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