[Solved] What type of queries benefit most from a hash index in PostgreSQL? — Ans: Queries using equality comparisons (=) | PostgreSQL

PostgreSQL - Indexing Strategies

What type of queries benefit most from a hash index in PostgreSQL?

AQueries using equality comparisons (=)

BQueries using range comparisons (<, >)

CQueries using pattern matching (LIKE)

DQueries using aggregate functions (SUM, AVG)

Step-by-Step Solution

Solution:

Step 1: Understand hash index purpose
Hash indexes are designed to speed up equality comparisons, where a value is matched exactly.
Step 2: Compare query types
Range queries and pattern matching do not benefit from hash indexes because hash indexes do not maintain order.
Final Answer:
Queries using equality comparisons (=) -> Option A
Quick Check:
Hash index use = A [OK]

Quick Trick: Hash indexes speed up exact matches, not ranges or patterns [OK]

Common Mistakes:

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What type of queries benefit most from a hash index in PostgreSQL?