Elance Exams Answers PDF file

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What does the following statement do? CREATE INDEX lower_title_idx ON books ((lower(title)));

Nothing, it's invalid SQL
Creates a non-write-locking index
Modifies an index in place to be lowercase
Creates a new index with a special operator class 'lower' for case insensitive comparisons.
Creates an index for efficient case-insensitive searches on the titles column within the books table
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