Explain the purpose of SQL indexes and their impact on query performance.
- Enhances data security
- Ensures data integrity
- Improves data retrieval speed
- Reduces storage space
SQL indexes are used to improve data retrieval speed by creating a sorted reference to data in a table. This reduces the time required to search and fetch specific records, especially in large datasets. Indexes don't impact storage space significantly but rather optimize data access, ensuring faster query performance. Indexes also contribute to enhancing data security by facilitating efficient data retrieval for authorized users.
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