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What is the main advantage of adding an index to a column in a database table?

easy📝 Conceptual Q1 of 15
SQL - Indexes and Query Performance
What is the main advantage of adding an index to a column in a database table?
AIt increases the storage space required for the table.
BIt improves the speed of data retrieval operations.
CIt automatically backs up the table data.
DIt prevents duplicate values in the column.
Step-by-Step Solution
Solution:

  1. Step 1: Understand Index Purpose

    Indexes are used to speed up query performance by allowing faster data lookup.

  2. Step 2: Analyze Options

    It improves the speed of data retrieval operations. correctly states the main benefit. Options B, C, and D describe unrelated or incorrect effects.

  3. Final Answer:

    It improves the speed of data retrieval operations. -> Option B

  4. Quick Check:

    Indexing speeds up queries [OK]
Quick Trick: Indexes speed up searches, not backups or duplicates [OK]
Common Mistakes:
  • Confusing indexing with data backup
  • Thinking indexes prevent duplicates
  • Assuming indexes reduce storage

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