Discussion
Which of the following is not true about indexes?
Answer: D
Correct answer: Indexes are created with the ALTER TABLE command.
Indexes are created with CREATE INDEX, and a unique index is also created implicitly when a primary key or unique constraint is declared. ALTER TABLE modifies the table, not the indexes on it. The other three statements are correct: indexes enforce uniqueness, speed retrieval, and are most worthwhile on columns frequently tested for equality.
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