[Solved] Why does PostgreSQL require partitions to have non-overlapping ranges or distinct list values? — Ans: To ensure each row maps to exactly one partition for data integrity | PostgreSQL

PostgreSQL - Table Partitioning

Why does PostgreSQL require partitions to have non-overlapping ranges or distinct list values?

ATo reduce disk space usage by merging partitions

BTo allow automatic replication of data across partitions

CTo enable partitions to share indexes

DTo ensure each row maps to exactly one partition for data integrity

Step-by-Step Solution

Solution:

Step 1: Understand partitioning rules
Partitions must be mutually exclusive to avoid ambiguity in row placement.
Step 2: Reason about data integrity
Non-overlapping ensures each row belongs to one partition, preserving data integrity.
Final Answer:
To ensure each row maps to exactly one partition for data integrity -> Option D
Quick Check:
Non-overlapping partitions ensure unique row placement [OK]

Quick Trick: Partitions must be mutually exclusive [OK]

Common Mistakes:

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Why does PostgreSQL require partitions to have non-overlapping ranges or distinct list values?