A mobile app for booking doctor appointments is running very slowly when accessing data from a database and the programmers think that poorly optimised SQL statements are causing it. There are three places where they think the code might be slow. 1. When users book a new appointment. 2. When the date of an appointment is modified. 3. When a user searches for doctors by name or specialty. Could any of these be improved by creating a database index? Why/Why not? What column or columns (if any) would be appropriate to add an index to?

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SQL Query

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